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danniellegomes
@danniellegomes
March 2022
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A ) (-x+5)(x+2)
B) (x² + x-1)(x-1)
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psaatk
b)
1 votes
Thanks 1
ingridkatrine
A)
-x² - 2x + 5x +10
- x² + 3x +10 = 0
Δ = 3² - 4 . -1 . 10
Δ = 9 + 40
Δ + 49
x = -(3) +/- √49 / ÷ 2
x= -3 +/- 7 / ÷2
x' = -3 +7 / 2
x' = 4/2 = 2
X'' = -3 -7 /2
x'' = -10/2 = -5
B) (x² + x -1)( x-1)
x³ - x² + x² - x - x +1
x³ - 2x +1 = 0
(não me lembro como se resolve)
0 votes
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danniellegomes
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b)
-x² - 2x + 5x +10
- x² + 3x +10 = 0
Δ = 3² - 4 . -1 . 10
Δ = 9 + 40
Δ + 49
x = -(3) +/- √49 / ÷ 2
x= -3 +/- 7 / ÷2
x' = -3 +7 / 2
x' = 4/2 = 2
X'' = -3 -7 /2
x'' = -10/2 = -5
B) (x² + x -1)( x-1)
x³ - x² + x² - x - x +1
x³ - 2x +1 = 0
(não me lembro como se resolve)