MATHEMATICS
Grade 11
MORE EXERCISES
Graphs of the exponential function.
  
        Question  1
     Sketch the graphs of the following
     functions :
     $$ \hspace*{2 mm}\mathrm{1.1\kern3mmy = 3^{x+1}  − 1\kern2mm\ } $$                      [ A 1.1 ]
     $$ \hspace*{2 mm}\mathrm{1.2\kern3mm3^{x − 1}   + 2\kern2mm\ } $$                           [ A 1.2 ]
     $$ \hspace*{2 mm}\mathrm{1.3\kern3mmy = 2^{1 − x}   + 3\kern2mm\ } $$                     [ A 1.3 ]
     $$ \hspace*{2 mm}\mathrm{1.4\kern3mmy = 3^{2 − x}  − 3\kern2mm\ } $$                       [ A 1.4 ]
     $$ \hspace*{2 mm}\mathrm{1.5\kern3mmy = 2.3^{x − 1}  + 2\kern2mm\ } $$                    [ A 1.5 ]
     $$ \hspace*{2 mm}\mathrm{1.6\kern3mmy = 3.2^{1 − x}   − 3\kern2mm\ } $$                   [ A 1.6 ]

        Question  2
       The figures show the graphs of the
$$ \hspace*{3 mm}\mathrm{\kern3mmfunctions\ with\ equation\ y = a^{x + p}  + q\kern2mm\ } $$
       Use the information given in the figure
       to detemine the values of p and q :

     2.1
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = 2^{x + p} + q\kern2mm\ } $$

       B is the point (0 ; 1,5)
                                                [ A 2.1 ]

     2.2
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = \Big(\frac{1}{3}\Big)^{x + p} + q\kern2mm\ } $$

       Horizontal asymptote : y = − 3 and A(1 ; 0)
       B is the point (0 ; 6) and P(2 ; − 2)
                                                [ A 2.2 ]

     2.3
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = 2^{x + p} + q\kern2mm\ } $$

       Given : A(3 ; 0), B(0 ; −1,75) and P(2 ; − 1)
                                                [ A 2.3 ]

     2.4
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = \Big(\frac{1}{2}\Big)^{x + p} + q\kern2mm\ } $$

       Given : B(0 ; 2,33) and P(−2 ; 5)
                                                [ A 2.4 ]

     2.5
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = a.b^x + q and y = 1\kern2mm\ } $$

       Given : A(1 ; 7) and B(0 ; 3)
                                                [ A 2.5 ]

     2.6
           
$$ \hspace*{5 mm}\mathrm{\kern3mmy = a.b^x + q\kern2mm\ } $$

       Given : A(0 ; 0) and B(− 2 ; 9)
      
                                                [ A 2.6 ]

        Question  3
       The figure shows the graph of
         y = 4x − 1   − 2
           

        3.1  Calculate the intercepts on
               the axes.                                            [ A 3.1 ]

        3.2  Calculate the value of p if P(2;p) is
               a point on the graph.                      [ A 3.2 ]

        3.3  Calculate the value of r if R(r;−1) is
               a point on the graph.                     [ A 3.3 ]

        3.4  For which values of x will
                   4x − 1   − 2 > 0?                               [ A 3.4 ]

        3.5  Write down the domain of
               the function.                                  [ A 3.5 ]

        3.6  Write down the range of
               the function.                                  [ A 3.6 ]

        Question  4
       The figure shows the graph of
           y = 2− x + 1   + 2
           
        4.1  Calculate the intercepts on
               the axes.                                         [ A 4.1 ]

        4.2  Calculate the value of p if P(-1 ; p)
               is a point on the graph.              [ A 4.2 ]

        4.3  Calculate the value of r if R(r ; 2,25)
               is a point on the graph.              [ A 4.3 ]

        4.4  Write down the domain of
               the function.                                [ A 4.4 ]

        4.5  Write down the range of
               the function.                                [ A 4.5 ]

        4.6  For which values of x will
               the function be positive?.         [ A 4.6 ]

        4.7  The function h(x) is formed
               when the function above is
               translated 4 units downwards.
               Write down the equation of
               the function h(x).                        [ A 4.7 ]

        Question  5
       The figure shows the graph of
$$ \hspace*{5 mm}\mathrm{\kern3mmy = \Big(\frac{1}{2}\Big)^{x − 1} − 4\kern2mm\ } $$

           
        5.1  Calculate the intercepts on
               the axes.                                         [ A 5.1 ]

        5.2  Calculate the value of c if C(c ; 4)
               is a point on the graph.              [ A 5.2 ]

        5.3  Write down the domain of
               the function.                                [ A 5.3 ]

        5.4  Write down the range of
               the function.                                [ A 5.4 ]

        5.5  For which values of x will
$$ \hspace*{12 mm}\mathrm{\kern3mmy = \Big(\frac{1}{2}\Big)^{x − 1} − 4 > 0?\kern2mm\ } $$             [ A 5.5 ]

        5.6  The function h(x) is formed
               when the function above is
               translated 2 units upwards.
               Write down the equation of
               the function h(x).                        [ A 5.6 ]

        Question  6
       The figure shows the graph of
$$ \hspace*{5 mm}\mathrm{\kern3mmy = \Big(\frac{1}{3}\Big)^{x + p} + q\kern2mm\ } $$

           
        6.1  Calculate the values of p and q.
                                                                         [ A 6.1 ]

        6.2  Calculate the value of p if P(p ; 2)
               is a point on the graph.               [ A 6.2 ]

        6.3  Write down the domain of
               the function.                                [ A 6.3 ]

        6.4  Write down the range of
               the function.                                [ A 6.4 ]

        6.5  The function h(x) is formed
               when the function above is
               translated 3 units upwards.
               Write down the equation of
               the function h(x).                        [ A 6.5 ]

        6.6  Write down the coordinates of
               the Y-intercept of h(x).               [ A 6.6 ]

        Question  7
         The diagram shows the graph of h(x) = 2x − 2
         P (p ; 30) is a point on the graph of h(x).
           
        7.1  Write down the equation of the
               horizontal asymptote.                   [ A 7.1 ]

        7.2  Calculate the coordinates of points
               the intercepts on the axes.             [ A 7.2 ]

        7.3  Determine the value of p.               [ A 7.3 ]

        7.4  For which values of x will h(x) ≤ 30?
                                                                            [ A 7.4 ]

        Question  8
        The diagram shows the graph of
        f(x) = p.2−x  + q
        D(−4 ;−12) and E(2 ; e) are points on
        the graph of f(x).
   
  
        8.1  Write down the equation of the
               horizontal asymptote.                   [ A 8.1 ]

        8.2  Determine the values of p and q
               and write down the equation
               of f(x).                                               [ A 8.2 ]

        8.3  Determine the value of e.             [ A 8.3 ]

        8.4  For which value(s) of x is
               f(x) < 3,75?                                        [ A 8.4 ]

        8.5  For which value(s) of x is
               f(x) > 0?                                             [ A 8.5 ]

        Question  9
        The diagram shows the graph of
        g(x) = 2x + p  + q
         A(2 ;11) is a point on the graph of g(x) and
         the y-intercept is (0 ; −1).
        9.1  Determine the values of p and q and
               thus the equation of g(x).                 [ A 9.1 ]

        9.2  Write down the equation of the
               horizontal asymptote.                       [ A 9.2 ]

        9.3  The graph of h is obtained
               by moving the graph of g 4 units
               downwards. Write down the
               equation of h(x).;                               [ A 9.3 ]

        9.4  The graph of k is obtained
               by moving the graph of g 3 units
               to the right. Write down the
               equation of k(x).;                               [ A 9.3 ]

        Question  10
        It is given that f(x) = 2x.

        10.1  The graph of g is obtained
                  by moving the graph of f 3 units
                  downwards. Write down the
                  equation of g(x).                          [ A 10.1 ]

        10.2  The graph of h is obtained
                  by moving the graph of f 2 units
                  to the left. Write down the
                  equation of h(x).                           [ A 10.2 ]

        Question  11
        Given that f(x) = 3−x.

        11.1  The graph of g is obtained
                  by moving the graph of f 2 units
                  upward.. Write down the
                  equation of g(x).                           [ A 11.1 ]

        11.2  The graph of h is obtained
                  by moving the graph of f 4 units
                  to the right. Write down the
                  equation of g(x).                           [ A 11.2 ]

        Question  12
        Given that f(x) = 5x + 3.

        12.1  The graph of g is obtained
                  by moving the graph of f 4 units
                  downwards. Write down the
                  equation of g(x).                           [ A 12.1 ]

        12.2  The graph of h is obtained
                  by moving the graph of f 4 units
                  to the left. Write down the
                  equation of h(x).                           [ A 12.2 ]

        Question  13
        Given that f(x) = − 3−x + 2.

        13.1  The graph of g is obtained
                  by moving the graph of f 2 units
                  upward. Write down the
                  equation of g(x).                           [ A 13.1 ]

        13.2  The graph of h is obtained
                  by moving the graph of f 3 units
                  to the right. Write down the
                  equation of h(x).                           [ A 12.2 ]

  
  
  
  
  
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