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Solve the quadratic equation : x2 + 3x - 9 = 0 for x.

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Solve the quadratic equation : x2 + 3x - 9 = 0 for x.

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Solution:

x = −b ± √(b2 − 4ac)/2a

x = -3 ± √[(32 − 4.1(-9)]/2.1

x = -3 ± √(45)/2

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