Respostas
respondido por:
1
3x²-7x+2=0
4x²-2x=6x-4
x²-5x+6=0
x²-8x+16=0
-x²+x+12=0
6x²+x-1=0
3x²-7x+2=0
3x²+5x=-x-9+2x²
4x²-x+1=x+3x²
x²+x-7=5
4x²-2x=6x-4
x²-5x+6=0
x²-8x+16=0
-x²+x+12=0
6x²+x-1=0
3x²-7x+2=0
3x²+5x=-x-9+2x²
4x²-x+1=x+3x²
x²+x-7=5
respondido por:
1
Boa tarde
1)
x² + 2x + 1 = 0
delta
d² = 4 - 4 = 0
d = 0
x1 = x2 = -2/2 = -1
2)
x² + 5x + 6 = 0
delta
d² = 25 - 24 = 1
d = 1
x1 = (-5 + 1)/2 = -2
x2 = (-5 - 1)/2 ) = -3
3)
x² + 13x + 42 = 0
delta
d² = 169 - 168 = 1
d = 1
x1 = (-13 + 1)/2 = -6
x2 = (-13 - 1)/2 = -7
4)
2x² - 3x - 2 = 0
delta
d² = 9 + 16 = 25
d = 5
x1 = (3 + 5)/4 = 2
x2 = (3 - 5)/4 = -1/2
5)
x² + 6x - 16 = 0
delta
d² = 36 + 64 = 100
d = 10
x1 = (-6 + 10)/2 = 2
x2 = (-6 - 10)/2 = -8
6)
4x² - x - 60 = 0
delta
d² = 1 + 960 = 961
d = 31
x1 = (1 + 31)/8 = 4
x2 = (1 - 31)/8 = -15/4
7)
x² - 11x + 30 = 0
delta
d² = 121 - 120 = 1
d = 1
x1 = (11 + 1)/2 = 6
x2 = (11 - 1)/2 = 5
8)
x² - 17x + 16 = 0
d² = 289 - 64 = 225
d = 15
x1 = (17 + 15)/2 = 16
x2 = (17 - 15)/2 = 1
9)
x² + 6x + 9 = 0
delta
d² = 36 - 36 = 0
d = 0
x1 = x2 = -6/2 = -3
10)
x² + 5x - 36 = 0
delta
d² = 25 + 144 = 169
d = 13
x1 = (-5 + 13)/2 = 4
x2 = (-5 - 13)/2 = -9
1)
x² + 2x + 1 = 0
delta
d² = 4 - 4 = 0
d = 0
x1 = x2 = -2/2 = -1
2)
x² + 5x + 6 = 0
delta
d² = 25 - 24 = 1
d = 1
x1 = (-5 + 1)/2 = -2
x2 = (-5 - 1)/2 ) = -3
3)
x² + 13x + 42 = 0
delta
d² = 169 - 168 = 1
d = 1
x1 = (-13 + 1)/2 = -6
x2 = (-13 - 1)/2 = -7
4)
2x² - 3x - 2 = 0
delta
d² = 9 + 16 = 25
d = 5
x1 = (3 + 5)/4 = 2
x2 = (3 - 5)/4 = -1/2
5)
x² + 6x - 16 = 0
delta
d² = 36 + 64 = 100
d = 10
x1 = (-6 + 10)/2 = 2
x2 = (-6 - 10)/2 = -8
6)
4x² - x - 60 = 0
delta
d² = 1 + 960 = 961
d = 31
x1 = (1 + 31)/8 = 4
x2 = (1 - 31)/8 = -15/4
7)
x² - 11x + 30 = 0
delta
d² = 121 - 120 = 1
d = 1
x1 = (11 + 1)/2 = 6
x2 = (11 - 1)/2 = 5
8)
x² - 17x + 16 = 0
d² = 289 - 64 = 225
d = 15
x1 = (17 + 15)/2 = 16
x2 = (17 - 15)/2 = 1
9)
x² + 6x + 9 = 0
delta
d² = 36 - 36 = 0
d = 0
x1 = x2 = -6/2 = -3
10)
x² + 5x - 36 = 0
delta
d² = 25 + 144 = 169
d = 13
x1 = (-5 + 13)/2 = 4
x2 = (-5 - 13)/2 = -9
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