Question

Which expression is equivalent to 20y2+5y? A) 5y(4y+1) B) −5y(4y−1) C) −5y(4y+1) D) 5y(4y−1)

Answer 1

A

Explanation:

I want to believe the question is

20y² + 5y

If so, then the answer is A. If we apply factorisation method to the question. We first start by finding the greatest common factor, and in this expression, the greatest common factor is 5y. So we write that down outside the bracket. Next, we divide 20y² by 5y and also 5y by 5y to give us 4y and 1. Thus, the answer is

5y(4y + 1).

This can be crops checked by opening the brackets once again.