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DouglasHenrique0409
@DouglasHenrique0409
December 2019
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X²-5x-14=0
Equação do 2° Grau
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lelunardi1
X² -5x -14 = 0 a = 1 b = -5 c = -14
Δ = b² - 4.a.c
Δ = -5² - 4.1.-14
Δ = 25 + 56
Δ = 81
x = -b +-
√Δ / 2a
x = -(-5) +- √81 / 2
x = 5 +- 9 / 2
x' = 5 + 9 / 2 x'' = 5 - 9 / 2
x' = 14 / 2 x'' = -4 / 2
x' = 7 x'' = -2
11 votes
Thanks 10
DouglasHenrique0409
obg pela resposta!! GRATO !!
Comentários (1)
Olá! ✨
x²-5x-14=0
a=1
b= -5
c= -14
Fórmula-
Δ=b²-4.a.c
x= -b+-√Δ /2.a
Substituindo as letras pelos seus respectivos valores-
Δ=(-5)²-4.1.(-14)
Δ=25+56
Δ=81
x'= -(-5)+√81 /2.1
x'=5+9 /2
x'=14 /2
x'=7 <---
x"= -(-5)-√81 /2.1
x"=5-9 /2
x"= -4 /2
x"= -2 <---
S={ -2, 7 }
2 votes
Thanks 5
DouglasHenrique0409
obrigado!!
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Δ = b² - 4.a.c
Δ = -5² - 4.1.-14
Δ = 25 + 56
Δ = 81
x = -b +- √Δ / 2a
x = -(-5) +- √81 / 2
x = 5 +- 9 / 2
x' = 5 + 9 / 2 x'' = 5 - 9 / 2
x' = 14 / 2 x'' = -4 / 2
x' = 7 x'' = -2
x²-5x-14=0
a=1
b= -5
c= -14
Fórmula-
Δ=b²-4.a.c
x= -b+-√Δ /2.a
Substituindo as letras pelos seus respectivos valores-
Δ=(-5)²-4.1.(-14)
Δ=25+56
Δ=81
x'= -(-5)+√81 /2.1
x'=5+9 /2
x'=14 /2
x'=7 <---
x"= -(-5)-√81 /2.1
x"=5-9 /2
x"= -4 /2
x"= -2 <---
S={ -2, 7 }