lawlerkennedy
lawlerkennedy
27-04-2017
Mathematics
contestada
How do i factor s^2+9s=-20
Respuesta :
choco4
choco4
27-04-2017
to factor you have to do this:
s^2 + 9s = -20
+ 20 +20
s^2 + 9s + 20 = 0
now you need to numbers that multiplied give you 20
and then those same 2 numbers have to add to 9
5 x 4 = 20
5+ 4 = 9
(x + 4) (x+ 5)
that means that x= -4, and -5
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