Expand (2x + y) (2x - y).

4x²-y²

Explanation:

FORMULA

a²-b²=(a+b)(a-b)

(a+b)(a-b)=a²-b²

(2x+y)(2x-y)=(2x)²-(y)²

                  =4x²-y²

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answer; equivalent to a one(1) horsepower motor;