The product of a binomial and a trinomial is x 3 + 3 x 2 − x + 2 x 2 + 6 x − 2. which expression is equivalent to this product after it has been fully simplified?
a=x3 + 5x2 + 5x – 2
b=x3 + 2x2 + 8x – 2
c=x3 + 11x2 – 2
d=x3 + 10x2 – 2

To simplify the expression:
x 3 + 3 x 2 − x + 2 x 2 + 6 x − 2

All the like terms should be combined.
3x2 and 2x2 are like terms
-x and 6x are like terms

So,
x3 + (3+2)x2 +(-1+6)x - 2
x3 + 5x2 + 5x - 2

Therefore, the answer is
A=x3 + 5x2 + 5x – 2