Question

Resolva as equações a seguir:
a) 2(x − 1) + 4 = 16
b) 8(x − 2) = 4(x − 2)
c) 3(x − 5) = −3(4 + x)

Answer 1

a) $2(x-1)+4=16$

$2x-2+4=16$

$2x=16+2-4$

$2x=14$

$x=\frac{14}{2}$

$x=7$

b) $8(x-2)=4(x-2)$

$8(x-2)-4(x-2)=0$

$4(x-2)=0$

$4x-8=0$

$4x=8$

$x=\frac{8}{4}$

$x=2$

c) $3(x-5)=-3(4+x)$

$3x-15=-12-3x$

$3x+3x=15-12$

$6x=3$

$x=\frac{3}{6}$

$x=\frac{1}{2}$