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Filename: controllers/calculator.php

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Given is an equation f(x) = x

To find the inverse of y = x

Solve for y Subtract 5 on both sides of the equation x - 5 = y

Now square root the equation on both sides y =± √(x - 5)

Therefore f(x)

Given is an equation f(x) = 4x

To find the inverse y = 4x

Solve for y Add 7 on both sides x + 7 = 4y

Now square root the equation on both sides and divide by 2.

2y/2 =± [√(x + 7)]/2

Therefore f(x)