Justify each step. I really need some help with this!

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Question:

Justify each step. I really need some help with this!

Answers

Answer:Step-by-step explanation:first step: expand the bracketsnext step: collect the liked term, a with a and b with bthird: factor the variables" a and b"fourth: do subtraction and addition inside the bracketsuntil it become: a(4)+b(4)finally: just multiply it(expand it)

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