Question

Resolva as equações:

A) 3x+2 (x+4) = 4×+18
B) 8 (x+3) -12=2 (x+6)
C) 4x-9 (x-3) = 3 (x-6)

Answer 1

A)
3x+2(x+4)=4x+18
3x+2+4x=4x+18
3x+4x-4x=18-2
3x=18-2
3x=16
x=16÷3
x=5,3333...

B)
8(x+3)-12=2(x+6)
8+3x-12=2+6x
3x-6x=2+12-8
-3x=6
x=6÷-3
x=3

C)
4x-9(x-3)=3(x-6)
4x-9-3x=3-6x
4x-3x+6x=3+9
7x=3+9
7x=12
x=12÷7
x=1,8(aprox.)

Answer 2

A)
3x² + 12 = 4x + 18
9x-4x = 18-12
5x = 6
x= 6÷5
x = 1/2

B)
8x + 24 - 12 = 2x + 12
8x - 2x = 12 - 24 + 12
6x = 0
x= 0÷6
x= 0

C)

4x -9x + 27 = 3x - 18
4x - 9x + 3x = -18 -27
-2x = -45
x = -45 ÷ -2
x = 22,5