SOLUTION: z^2 + 12z + 15 = 0 I tried in the Quadractic having trouble solving it.

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Question 298458: z^2 + 12z + 15 = 0
I tried in the Quadractic having trouble solving it.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
z^2 + 12z + 15 = 0
z+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
z=(-12+-sqrt[12^2-4*1*15])/2
z=(-12+-sqrt144-60])/2
z=(-12+-sqrt84)/2
z=(-12+-9.165)/2
z=(-12+9.165)/2
z=-2.835/2
z=-1.4175 ans.
z=(-12-9.165)/2
z=(-21.165)/2
z=-10.5825 ans.