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2 November, 23:47

17. (5a + 6) 2 =

A. 25a2 + 36

B. 25a2 - 36

C. 25a2 + 30a + 36

D. 25a2 + 60a + 36

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  1. 3 November, 00:12
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    D. 25a² + 60a + 36

    Step-by-step explanation:

    You have memorized the form ...

    (p + q) ² = p² + 2pq + q²

    so you can write down immediately the result for p=5a and q=6:

    (5a) ² + 2 (5a) (6) + 6² = 25a² + 60a + 36
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