bbyhaiz02
bbyhaiz02
25-04-2017
Mathematics
contestada
what two numbers add to -7 and multiply to 12?
Respuesta :
irspow
irspow
25-04-2017
a+b=-7 and ab=12
from the first we can say a=-b-7 and using this value for a in the second we get:
(-b-7)b=12
-b^2-7b=12
b^2+7b+12=0
b^2+3b+4b+12=0
b(b+3)+4(b+3)=0
(b+4)(b+3)=0
So the numbers are -3 and -4
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