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Maxim
Mathematics
8 October, 19:36
Solve x2+10x+21=0 ... ?
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Zavier Horton
8 October, 19:38
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X²+10x+21=0
/ / = 10²-4*1*21
/ / = 100 - 84
/ / = 16
x = (-10+/-//16) / 2
x = (-10+/-4) / 2
x' = (-10+4) / 2 = - 6/2 = - 3
x" = (-10-4) / 2 = - 14/2 = - 7
S: {-3; - 7}
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