( -8x + 3x 4 ) - ( -7x - 6x 4 )

9x^4 -x

Step-by-step explanation:

( -8x + 3x^4 ) - ( -7x - 6x^4 )

Distribute the minus sign

( -8x + 3x^4 ) +7x + 6x^4

Combine like terms

3x^4 + 6x^4  -8x +7x

9x^4 -x

x + 9x^4

Step-by-step explanation:

There is some confusion here.  You likely meant by "3x 4" the power term 3x^4 and by "6x 4" the power term 6x^4.   " ^ " indicates exponentiation.

Step 1:  Eliminate the parentheses.  Simply drop them from the first term.

The first term becomes -8x + 3x^4 and the second term becomes 7x + 6x^4.

Now combine like terms:

 -8x + 3x^4

+ 7x + 6x^4

    x + 9x^4

ab will be equal to