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Liviamarchese
@Liviamarchese
April 2020
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(x+5).(x-3)= 0 resolução
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JimmyNeutron
(x+5).(x-3)= 0
x² -3x + 5x - 15 = 0
x² + 2x - 15 = 0 ~> a = 1 , b = 2 , c = -15
Δ = b² - 4ac
Δ = 2² - 4.1.(-15)
Δ = 4 - (-60)
Δ = 64
x =
-b
±
√Δ
2a
x =
-2
±
√64
2.1
x =
-2
± 8
2
x' =
-2 + 8
=
6
= 3 x" =
-2 - 8
=
-10
= -5
2 2 2 2
S = {-5 ; 3 }
3 votes
Thanks 1
liviamarchese
obg :)
sarahfurtado01
(x+5) (x-3)=0x^2-3x+5x-15
x^2+2x-15
b^2-4ac
(2)^2-4.1(-15)
4+60=64
1Δ=3
2Δ=-5
1 votes
Thanks 1
liviamarchese
obg :)
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Lista de comentários
x² -3x + 5x - 15 = 0
x² + 2x - 15 = 0 ~> a = 1 , b = 2 , c = -15
Δ = b² - 4ac
Δ = 2² - 4.1.(-15)
Δ = 4 - (-60)
Δ = 64
x = -b ± √Δ
2a
x = -2 ± √64
2.1
x = -2 ± 8
2
x' = -2 + 8 = 6 = 3 x" = -2 - 8 = -10 = -5
2 2 2 2
S = {-5 ; 3 }
x^2+2x-15
b^2-4ac
(2)^2-4.1(-15)
4+60=64
1Δ=3
2Δ=-5