Question

Resolva:
a) 4(X+3) = 20.
b) 5(2X-1) = 2(X+4)
c) 10-2(X+3) = 8+3(2X+5)​

Answer 1

Multiplica o 4 por todos dentro do parêntese

A) 4.X + 4.3 = 20
4x + 12 = 20
4x = 20-12
4x = 8
X = 8:4
X = 2

B) 5(2x-1) = 2(x+4)
5.2x -1.5 = 2.x + 2.4
10x -5 = 2x +8
10x-2x = 8+5
8x = 13
X = 13:8
X= 1,625

C) 10-2(x+3)=8+3(2x+5)
8(x+3)=11(2x+5)
8.x + 8.3 = 11.2x + 11.5
8x + 24 = 22x + 55
8x -22x = 55 -24
-14x = 31
X = 31:-14
X = - 2,214..