Question

X^2 times 4x-x times 4x

Answer 1

If you were to write it fully, as an equation, I believe it would look like this:
    x²(4x-x) *4x
Therefore allowing you to simplify the area within the bracket into:
    x²(3x)*4x
To expand, you simply start on the left and work your way across.
    3x³*4x= 12x⁴