Determine if Injective (One to One) f(x) = square root of 18-x^2

$f (x) = \sqrt{18 - x^{2}}$

Step 1

Write $f (x) = \sqrt{18 - x^{2}}$ as an equation.

$y = \sqrt{18 - x^{2}}$

Step 2

A function is said to be injective or one-to-one if every y-value has only one corresponding x-value.

Injective (One-to-One)

Step 3