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Antoniomagalhaes3
@Antoniomagalhaes3
December 2019
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(3x-1) elevado ao quadrado + (x-2) elevado ao quadrado = 25
Me ajudem... As raízes devem ser -1 e 2.
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PauloLuis
(3x - 1)² + (x - 2)² = 25
(3x)² - 2.3x.1 - 1² + x² - 2.x.2 - 2² = 25
9x² - 6x + 1 + x² - 4x + 4 = 25
10x² - 10x - 20
Δ = b²
- 4.a.c
Δ = -10²
- 4 . 10 . -20
Δ = 100 - 4. 10 . -20
Δ = 900
Há 2 raízes reais.
x = (-b +- √Δ)/2a
x' = (--10 + √900)/2.10
x'' = (--10 - √900)/2.10
x' = 40 / 20
x'' = -20 / 20
x' = 2
x'' = -1
1 votes
Thanks 2
Comentários (1)
(3x-1)²+(x-2)²=25
(3x-1).(3x-1)+(x-2).(x-2)-25=0
9x²-3x-3x+1+x²-2x-2x+4-25=0
10x²-6x-4x+1+4-25=0
10x²-10x-20=0
/\=(-10)²-4.10.(-20)
/\=100+800
/\=900
x'= -(-10)+30/20
x'=10+30/20
x'=40/20
x'=2
x"= -(-10)-30/20
x"=10-30/20
x"= -20/20
x"= -1
S={2,-1}
1 votes
Thanks 2
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Lista de comentários
(3x)² - 2.3x.1 - 1² + x² - 2.x.2 - 2² = 25
9x² - 6x + 1 + x² - 4x + 4 = 25
10x² - 10x - 20
Δ = b² - 4.a.c
Δ = -10² - 4 . 10 . -20
Δ = 100 - 4. 10 . -20
Δ = 900
Há 2 raízes reais.
x = (-b +- √Δ)/2a
x' = (--10 + √900)/2.10x'' = (--10 - √900)/2.10
x' = 40 / 20
x'' = -20 / 20
x' = 2
x'' = -1
(3x-1).(3x-1)+(x-2).(x-2)-25=0
9x²-3x-3x+1+x²-2x-2x+4-25=0
10x²-6x-4x+1+4-25=0
10x²-10x-20=0
/\=(-10)²-4.10.(-20)
/\=100+800
/\=900
x'= -(-10)+30/20
x'=10+30/20
x'=40/20
x'=2
x"= -(-10)-30/20
x"=10-30/20
x"= -20/20
x"= -1
S={2,-1}