Pre-Calc

Seeking step by step help with this question...Thank you much.

Let f(x) =|9x|. For the area above the x-axis and between the lines x= -9 and x=18

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asked by Amy
  1. I made a sketch, and y = |9x| consists of two lines
    first: y = 9x starting at the origin, and the second:
    y = -9x also starting in the origin,
    resulting in a graph looking like a V

    If I understand the question correctly, you now want the area of the triangle in the second quadrant and the triangle in the first quadrant

    left triangle: base = 8 , height = 72 , Area = 8*72/2=288
    right triangle: base = 18, height = 162, Area = 1456

    area = 288+1456 = 1746

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    posted by Reiny

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