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Mathematics
Harley Oliver
2 February, 16:49
Solve for x x2+4x-21=0
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Lacey Camacho
2 February, 19:55
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If I did my math correctly it would be that x=2.04
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Maryjane Conley
2 February, 20:08
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First you calculate the determinant:
d=b^2-4ac
d=4^2-4*1 * (-21) = 16+84=100
Because d>0 there are two solutions for x:
x_1 = (-b+√d) / 2a = (-4+√100) / 2*1 = 6/2 = 3
x_2 = (-b-√d) / 2a = (-4-√100) / 2*1 = - 14/2 = - 7
The solutions for x is x = 3 and x = - 7
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