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Use the quadratic equation: x = (-b plusminus root(b2 - 4ac)) / 2a

In this case, a = 1, b = 9, c = 12.

Another answer:

x2+9x+12 = 0

When factorised by means of the quadratic equation formula:

(x+7.372281323)(x+1.627718677) = 0

Therefore the roots are: -7.372281323 and -1.627718677

Check that your answer is correct by multiplying out the brackets which should bring you back to x2+9x+12 = 0

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15y ago

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