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4 March, 04:33

What value of c makes 36x^2+84x+c a perfect square trinomial?

a) 49

b) 7

c) 9

d) 4

+3
Answers (2)
  1. 4 March, 05:41
    0
    (6x+7) (6**7)

    Multiply 6x by 6x 36*2

    6 * (7) = 42*

    7 (6*) = 42*

    7 [7) = 49
  2. 4 March, 06:57
    0
    36x^2 + 84x + c

    The middle term in a perfect square trinomial =

    2 * sqrt a * sqrt c

    Divide 84 by 2 = 42

    Take the sqrt of 36 = 6

    42/6 = 7

    sqrt c = 7

    So c = 49
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