Question

resolva as equações
a) 4(x + 1) =12
b) 5(3 - x) -4x = 18

Answer 1

Oi,

Resolução

a) 4(x + 1) =12
4x + 4 = 12
4x = 12 - 4
4x = 8
x = 8/4
x = 2


b) 5(3 - x) -4x = 18
15 - 5x - 4x = 18
- 5x - 4x = 18 - 15
- 9x = 3 . (-1)
9x = - 3
x = - 3/9
x = - 1/3

Espero ter ajudado e bons estudos !

Answer 2

$a) \\ \\ 4(x + 1) = 12 \\ \\ 4x + 4 = 12 \\ \\ 4x = 12 - 4 \\ \\ 4x = 8 \\ \\ x = \dfrac{8}{4} \\ \\ x = 2$

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$b) \\ \\ 5(3 - x) - 4x = 18 \\ \\ 15 - 5x - 4x = 18 \\ \\ 15 - 9x = 18 -15 \\ \\ -9x = 3 (-1) \\ \\ 9x = -3 \\ \\ x = \dfrac{-3}{9} \\ \\ \\ x = -\dfrac{1}{3}$