How do I solve number 3b and c

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mykayleighn
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Your work looks find for problem 3b. What do you get for problem 3c?

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For 3b, I think the goal is to actually expand the expressions in the parenthesis, starting with (t-2)^2 = t^2 + ? t + ? ..., then combine with the remaining terms. For 3c, use the answer from 3a.