What is the error in the student work below?

The negative 16 in the second line should be positive 16.

See attached picture:

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

welll its a very hard question but ill

step-by-step explanation:

first you take the 6 dollars and add 10 to it then add the 50 to that then multiply by 8 with xy and your answer will be

hope this