Hey! Please help! Online school has me all confused. :(

Find the missing factor. write your answer inexponential form.9^2=9^4×

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.

How many zeros does this polynomial function, y=(x-8)(x+3)^2