Question

calcule o valor de X nas equações sendo U=Q a)4 (X+3)=20 b)5 (2X-1)=(X+4) C)10-2 (X+3)=8+3(2X+5)

Answer 1

a) 4(x+3)=20
4x + 12 =20
4x= -12+20= 8
x= 8:4 = 2x

b) 5 (2x-1)=(x+4)
10x - 5 = 5x + 20
10x - 5x= 20 + 5
5x= 25
x= 25:5 = 5x

c) 10-2(x+3) = 8+3(2x+5)
8(x+3) = 11(2x+5)
8x + 24 = 22x + 55x
8x - 22x - 55x = -24
-69x = -24

Answer 2

a)
4.(x+3)=20
4x + 12 = 20
4x = 20 - 12
4x = 8
x = 8/4
x = 2
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
5.(2x - 1) = (x + 4)
10x - 5 = x + 4
10x - x = 4 + 5
9x = 9
x = 9/9
x = 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
C)
10 - 2(x + 3) = 8 + 3(2x + 5)
10 - 2x - 6 = 8 + 6x + 15
10 - 6 - 2x = 8 + 15 + 6x
4 - 2x = 23 + 6x
4 - 23 = 6x + 2x
- 19 = 8x
8x = - 19
x = - 19/8