Question

7.
Resolva as equações:
a) 8 (x + 2) = 4(x + 6)
b) 8 (x + 3) = 40 41
c) 12x – 14 (1 - x) - 2 (10x + 4) = 0
d) 10 (2x - 1) = 4(x + 4)
e) 10x – 20 (x - 1) = 40 - 30 (x - 2)​

Answer 1

Respostfa:

a)8 (x + 2) = 4(x + 6)

8x+16=4x+24

8x-4x=24-16

4x=8

X=8/4

X=2

b) 8 (x + 3) = 40 41 ?

c) 12x – 14 (1 - x) - 2 (10x + 4) = 0

12x-14+14x-20x-8=0

-8x-8=0

-8x=8

X=-1

d) 10 (2x - 1) = 4(x + 4)

20x-10=4x+16

20x-4x=16+10

16x=26

X=26/16

e) 10x – 20 (x - 1) = 40 - 30 (x - 2)​

10x-20x+20=40-30x+60

10x-20x+30x=40+60-20

20x=80

X=80/20

X=4