Question 451774
solve the equation 
x^2+10x+15=0

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Use the quadratic formula:
x = [-10 +- sqrt(100-4*1*15)]/2
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x = [-10 +- sqrt(40)]/2
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x = [-10 +- 2sqrt(10)]/2
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x = -5+sqrt(10) or x = -5-sqrt(10)
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Cheers,
Stan H.