Question

Given y = x^2 - 4, what is the value of y when x = -5?​

Answer 1

21

Explanation:

y =
`x^(2)` -4 Substitute in -5 for x

y =
`(5)^(2)` - 4

y = 25 - 4

y = 21

Answer 2

y = 21

Explanation:

Plug in -5 into the equation

(-5)² - 4
25 - 4 = 21