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11 June, 16:29

Given f (x) = the quantity of x minus 5, divided by 3, solve for f-1 (3).

-1

14

18

21

+2
Answers (1)
  1. 11 June, 17:11
    0
    Remark

    Let f (x) = y must to make it easier to write.

    Equation

    Original Equation: y = (x - 5) / 3

    Inverse

    Interchange the x and y. You get x = (y - 5) / 3

    Solve for y in the inverse.

    x = (y - 5) / 3 Multiply by 3

    3x = y - 5 Add 5 to both sides.

    3x + 5 = y

    substitute f1 (x) back into the equation.

    3x + 5 = f (x) Now put in 3 for x

    f (3) = 3x + 5

    f (3) = 3*3 + 5

    f (3) = 14 <<< Answer
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