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28 January, 12:18

Factoring by completing the square: 3k^2+18k+15=0

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  1. 28 January, 16:16
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    3k^2 + 18k + 15 = 0

    3k^2 + 18k = - 15

    k^2 + 6k = - 5

    k^2 + 6k + 9 = - 5 + 9

    (k + 3) ^2 = 4

    k + 3 = (+-) sqrt 4

    k = - 3 (+-) sqrt 4

    k = - 3 + 2 = - 1

    k = - 3 - 2 = - 5

    so k = - 1 and - 5
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