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

Answer:

addition property of equality.

Step-by-step 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