Question

Simplify the following expression:

Answer 1

`= 3 {x}^(2) + 10x - y` (last option)

Explanation:

`2x - 8y + 3 {x}^(2) + 7y - 12x`

`2x - 12x = (2 - 12)x = - 10x`

`- 10x - 8y + 3 {x}^(2) + 7y`

`- 8 + 7y = ( - 8 + 7)y = - 1y = - y`

`= 3 {x}^(2) + 10x - y`

Answer 2

3x^2-15y-10x

Explanation:

2x-12x-8y+7y+3x^2

-10x-15y+3x^2

3x^2-15y-10x