Question

When solving


`4(3 {x}^(2) + 2) - 9 = 8 {x}^(2) + 7`
Emily wrote

`4(3 {x}^(2) + 2 = 8 {x}^(2) + 16`
as her first step. Which property justifies Emily's first step?

Answer 1

addition property of equality.

Explanation:

4(3 x^2 + 2) - 9 = 8 x^2 + 7

We can add 9 to each side, by using the addition property of equality.

a=b then a+c = b+c