andrawimadropsta
andrawimadropsta
21-11-2016
Mathematics
contestada
solve x2+10x+21=0 ...?
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mozarth11
mozarth11
21-11-2016
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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