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Felipesnow01p21pmv
@Felipesnow01p21pmv
November 2019
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Galera resolve essa essa do 2 grau A) 4x² - 3x - 1 = 0 B) 2² - 5x - 3 = 0
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tutztuh
Vamos lá, PARA RESOLVERMOS EQUAÇÕES DO SEGUNDO GRAU, UTILIZAMOS FÓRMULA DE BASKARA... ENTÃO VAMO LÁ:
A)
4x² - 3x - 1
a=4
b= -3
c= -1
BORA ACHAR O DELTA AGORA,
Δ= b
² - 4.a.c
=> Δ= (-3)
² - 4.4.(-1)
Δ= 9 -16.(-1)
Δ= 9+16
Δ= 25
AGORA É SÓ CALCULAR AS RAÍZES:
=> (-b±√Δ)/2a
=> [-(-3)±√25]/2.4
[3±5]/8
AGORA VAMOS DE FATO CALCULAR AS RAÍZES:
=> x'= (3+5)/8
x'= 8/8
x'= 1
=> x"= (3-5)/8
x"= (-2)/8
x"= (-1/4)
B)
2² - 5x - 3 = 0
=>
2² - 5x - 3 = 0
4-5x-3= 0
5x=0-4+3
5x= -4+3
5x= -1
x= -1/5
Espero ter ajudado... Feliz 2018
1 votes
Thanks 1
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A) 4x² - 3x - 1
a=4
b= -3
c= -1
BORA ACHAR O DELTA AGORA,
Δ= b² - 4.a.c
=> Δ= (-3)² - 4.4.(-1)
Δ= 9 -16.(-1)
Δ= 9+16
Δ= 25
AGORA É SÓ CALCULAR AS RAÍZES:
=> (-b±√Δ)/2a
=> [-(-3)±√25]/2.4
[3±5]/8
AGORA VAMOS DE FATO CALCULAR AS RAÍZES:
=> x'= (3+5)/8
x'= 8/8
x'= 1
=> x"= (3-5)/8
x"= (-2)/8
x"= (-1/4)
B) 2² - 5x - 3 = 0
=> 2² - 5x - 3 = 0
4-5x-3= 0
5x=0-4+3
5x= -4+3
5x= -1
x= -1/5
Espero ter ajudado... Feliz 2018