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CarlaCastro16
@CarlaCastro16
December 2019
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1- Calcule:
2x²+2x=40
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AlissonLaLo
2x^2+2x=40 vai ficar assim 2x^2+2x-40=0
vamos achar o valor de Delta :
D=B^2-4.a.c
D=2^2-4.2(-40)
D=4-8(-40)
D=4+320
D=324
agora vamos achar as raizes :
x=-B +/- Raiz de Delta
x=-2 +/- 324
x=-2+/-18 Sobre 2.a
x=-2 +/- 18 Sobre 4
X, = -5
X,, = 8
Espero ter ajudado :D
2 votes
Thanks 2
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Lista de comentários
vamos achar o valor de Delta :
D=B^2-4.a.c
D=2^2-4.2(-40)
D=4-8(-40)
D=4+320
D=324
agora vamos achar as raizes :
x=-B +/- Raiz de Delta
x=-2 +/- 324
x=-2+/-18 Sobre 2.a
x=-2 +/- 18 Sobre 4
X, = -5
X,, = 8
Espero ter ajudado :D