Darlene wrote this proof of the identity (x + y) 2 - (x - y) 2 = 4xy. Which of the following is a justification for Step 5 of her proof?
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Home » Mathematics » Darlene wrote this proof of the identity (x + y) 2 - (x - y) 2 = 4xy. Which of the following is a justification for Step 5 of her proof?