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Graph the exponential function y = 2^x and its inverse y = log base 2 of x.

Mathematics

ScanSolve AI Answer

Step-by-step solution

4 steps
  1. Complete the table of values for x=2yx = 2^y.

    The given yy values are −3,−2,−1,0,1,2,3-3, -2, -1, 0, 1, 2, 3. We calculate xx for each yy:

    • If y=−3y = -3, x=2−3=18x = 2^{-3} = \frac{1}{8}
    • If y=−2y = -2, x=2−2=14x = 2^{-2} = \frac{1}{4}
    • If y=−1y = -1, x=2−1=12x = 2^{-1} = \frac{1}{2}
    • If y=0y = 0, x=20=1x = 2^0 = 1
    • If y=1y = 1, x=21=2x = 2^1 = 2
    • If y=2y = 2, x=22=4x = 2^2 = 4
    • If y=3y = 3, x=23=8x = 2^3 = 8

    The completed table of values is:

    xy18−314−212−110214283\boxed{ \begin{array}{|c|c|} \hline x & y \\ \hline \frac{1}{8} & -3 \\ \hline \frac{1}{4} & -2 \\ \hline \frac{1}{2} & -1 \\ \hline 1 & 0 \\ \hline 2 & 1 \\ \hline 4 & 2 \\ \hline 8 & 3 \\ \hline \end{array} }
  2. Plot the graph of y=log⁡2xy = \log_2 x.

    Plot the points from the table: (18,−3)(\frac{1}{8}, -3), (14,−2)(\frac{1}{4}, -2), (12,−1)(\frac{1}{2}, -1), (1,0)(1, 0), (2,1)(2, 1), (4,2)(4, 2), (8,3)(8, 3). Draw a smooth dashed curve through these points. This curve represents y=log⁡2xy = \log_2 x.

  3. Plot the graph of y=2xy = 2^x.

    Since y=2xy = 2^x is the inverse of y=log⁡2xy = \log_2 x, its points are obtained by swapping the xx and yy coordinates from the table in Step 1. The points for y=2xy = 2^x are: (−3,18)(-3, \frac{1}{8}), (−2,14)(-2, \frac{1}{4}), (−1,12)(-1, \frac{1}{2}), (0,1)(0, 1), (1,2)(1, 2), (2,4)(2, 4), (3,8)(3, 8). Draw a smooth solid curve through these points. This curve represents y=2xy = 2^x.

  4. Draw the line y=xy = x.

    Draw a straight line passing through the origin (0,0)(0,0) with a slope of 1. This line acts as the axis of symmetry between the graph of a function and its inverse.

    The final graph will show the exponential function y=2xy=2^x (solid curve), the logarithmic function y=log⁡2xy=\log_2 x (dashed curve), and the line y=xy=x (typically a dashed or dotted line for reference), demonstrating their inverse relationship as mirror images across y=xy=x.

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