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Taty9635
@Taty9635
December 2019
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Encontre a solução das seguintes equações:
a) (x-7)(x-3)+10x=30
b)2x(x+1)=x(x+5)+3(12-x)
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victor88srocha
(x-7)(x-3)+10x=30
2x-3x-7x+21+10x=30
18x=30-21
X=9/18= 0,5
0 votes
Thanks 0
victor88srocha
2x(x+1)=x(x+5)+3(12-x)
jjzejunio
A) (x - 7) (x - 3) + 10x = 30
x² - 7x - 3x +21 + 10x = 30
x² - 10x + 10x + 21 - 30= 0
x² - 0x - 9 = 0
x² - 9 = 0
x² = 9
x = √9
x= 3
b) 2x (x +1) = x(x + 5) + 3(12 - x)
2x² + 2x = x² + 5x + 36 - 3x
2x² - x² + 2x - 5x + 3x - 36
x² - 0x - 36= 0
x² - 36 = 0
x² = 36
x = ±√36
x = ± 6
1 votes
Thanks 0
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Lista de comentários
2x-3x-7x+21+10x=30
18x=30-21
X=9/18= 0,5
x² - 7x - 3x +21 + 10x = 30
x² - 10x + 10x + 21 - 30= 0
x² - 0x - 9 = 0
x² - 9 = 0
x² = 9
x = √9
x= 3
b) 2x (x +1) = x(x + 5) + 3(12 - x)
2x² + 2x = x² + 5x + 36 - 3x
2x² - x² + 2x - 5x + 3x - 36
x² - 0x - 36= 0
x² - 36 = 0
x² = 36
x = ±√36
x = ± 6