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Jetta
Mathematics
13 December, 10:55
Factoring by completing the square: 3k^2+18k+15=0
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Libby Fitzpatrick
13 December, 10:59
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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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