Question

1)Resolva as equações. a)4x-1=3(x-1) b)3(x-2)=2x-4 c)2(x-1)=3x+2 d)3(x-1)-7=15

Answer 1

A) 4x-1=3(x-1) ~> 4x-1=3x-3 ~> 4x-3x=-3+1 ~> x=-2.........................
B) 3(x-2)=2x-4 ~> 3x-6=2x-4 ~> 3x-2x= - 4+6 ~> x= 2 ...............
C) 2(x-1)=3x+2 ~> 2x-2=3x+2 ~> 2x-3x= 2+2 ~> - x= 4 ~> x=4/-1 ~> x=-4................ .....
D) 3(x-1)-7=15 ~> 3x-3-7=15 ~> 3x =15+3+7 ~> 3x=25 ~> x =25/3.

Answer 2

a) 4x-1=3(x-1)
4x-1=3x-3
4x-3x=-3+1
x=-2

b) 3(x-2)=2x-4
3x-6=2x-4
3x-2x=-4+6
x= 2

c) 2(x-1)=3x+2
2x-2=3x+2
2x-3x=2+2
-x= 4 *(-1)
x= -4

d) 3(x-1)-7=15
3x-3-7=15
3x-10=15
3x=15+10
3x= 25
x= 25÷3
x= aproximadamente maior que 8