DerryDelaney
DerryDelaney
16-10-2016
Mathematics
contestada
Solve x^2 + 2x - 15 = 0
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Аноним
Аноним
16-10-2016
x^2+2x-15 = 0
x^2-3x+5x-15=0
x(x-3) 5(x-3) =0
x+5 = 0 OR x-3=0
x=-5 OR x=3
It can be either
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MaliaHale
MaliaHale
16-10-2016
x^2+2x=15
x^2+x=15:2
x=1,365
I think this is the solution
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