lawlerkennedy lawlerkennedy

27-04-2017
Mathematics

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How do i factor s^2+9s=-20

Respuesta :

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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