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12 February, 01:34

Solve for a.

(a+6) ^2=49

A - 13 and 1

B - 3 √6 and 3 √6

C - 1 and 13

D - √43 and √43

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Answers (1)
  1. 12 February, 01:51
    0
    (a+6) ^2 = 49

    (a+6) (a+6) = 49

    a^2 + 6a + 6a + 36 = 49

    a^2 + 12a - 13 = 0

    (a-1) (a+13) = 0

    a-1 = 0

    a = 1

    a+13 = 0

    a = - 13

    The answer is A.
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