Question

While attempting to multiply the expression (3x + 7)" a student made mistakes. Explain and write the correct way.

Answer 1

9x²+42x+49

Explanation:

that is not the correct way to foil.

the correct way would be (3x+7)²= (3x+7)(3x+7)

simplifying that would give us 9x²+42x+49

his mistake was multiplying wrong because he did not foil