Answer:
This is +16x not minus 16x as shown in the problem
Step-by-step explanation:
4x^3 + 4x^2 -8x-(8x^2 -16x+4)
Distribute the minus sign
4x^3 + 4x^2 -8x-8x^2 +16x-4
The error is here This is +16x not minus 16x as shown in the problem
4x^3 -4x^2 +8x-4
