Question

Who can finish this for me

Answer 1

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

Explanation:

`(5 - 5 {x}^(4) - {x}^(3) ) - (6 {x}^(3) - 4 {x}^(4) - 3)`

Remove unnecessary parentheses

`5 - 5 {x}^(4) - {x}^(3) - (6 {x}^(3) - 4 {x}^(4) - 3)`

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

`5 - 5 {x}^(4) - {x}^(3) - 6 {x}^(3) + 4 {x}^(4) + 3`

Collect like terms

`5 + 3 - 5 {x}^(4) + 4 {x}^(4) - {x}^(3) - 6 {x}^(3)`

`5 + 3 - {x}^(4) - 7 {x}^(3)`

Add the numbers

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

Use the commutative property to reorder the terms

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

Hope this helps...

Best regards!!