Hi, I would help with question 1.5. I don't know what exactly to do for it. It's practice questions and I wanna be ready for the real thing.
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$a^2b + a b^2 + a^2 - b^2 -(a+b)$ $(a-1)(b^2 + a +a b + b)$ $(a-1)(b+1)(a+b)$