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OpenStudy (anonymous):
Solve the quadratic equation 0 = x^2 + 6x + 9 . would it be 3,-3?
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OpenStudy (kira_yamato):
x = -3
OpenStudy (anonymous):
how come just -3?
OpenStudy (kira_yamato):
x^2 + 6x + 9 = (x + 3)^2
OpenStudy (anonymous):
(-6 +/- sqrt(36-4*9)) / 2 36-4*9 = 0 also : x^2 +6x + 9 = x^2 + 3x + 3x + 9 = x(x+3) + 3(x+3) = (x+3)(x+3)
OpenStudy (anonymous):
ok
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