Answer:
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
