Question

4x2 + 8x - 7 - (3x2 - X+9)​

Answer 1

`{x}^(2) + 9x - 16`

Explanation:

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

When there is a (-) in front of an expression in parentheses, change the sign of each term in the expression:

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

Collect like terms

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

`{x}^(2) + 9x - 7 - 9`

Calculate

`{x}^(2) + 9x - 16`

Hope this helps...

Good luck on your assignment...