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19 October, 07:17

Solve the quadratic by quadratic formula below

a^2-4a=21

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Answers (1)
  1. 19 October, 09:37
    0
    a^2 - 4a = 21

    by trasponsing 21 to the left:

    a^2 - 4a - 21 = 0

    by quadratic formula:

    x = [ - (-4) ± sqrt [ ( - 4) ^2 - 4 (1) (-21) ]] / 2 (1)

    x = [4 ± sqrt (100) ] / 2

    x = [4 ± 10] / 2

    x = - 3, 7
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