1. Resolva as seguintes equações. a) 2x +7 = 5 b) 3x + 2 = x -3 c) 4 x + 6 = 12 – 2 x d) – 10 + 4 – 2 x = – 4 x – 7 e) 2 – 4 x = 32 – 18 x + 12 f) 4 ( x + 5 ) + 3 ( x + 5 ) = 21 g) 8 ( x – 1 ) = 8 – 4 ( 2 x – 3 ) h) 2 ( x + 5 ) – 3 ( 5 – x ) = 10
Urgente por favor!
Soluções para a tarefa
a) 2x + 7 =5
2x= 5-7
2x= -2
x = -2/2
x =-1
b) 3x +2 = x-3
3x -x=-3-2
2x = -5
x = -5/2
c) 4x +6 =12 -2x
4x + 2x = 12 -6
6x= 6
x= 6/6
x=1
d) -10 +4 -2x = -4x -7
-2x + 4x= -7 +10 -4
2x= +3 -4
2x = -1
x= -1/2
e) 2-4x= 32 -18 x +12
-4x +18x= 32+12 -2
14 x = 44-2
14 x = 42
x= 42/14 ( simplificamos por 7 )
x= 6/2
x= 3
f) 4 ( x +5 ) + 3 ( x +5 )=21
4 x + 20 + 3x + 15 = 21
4x +3x = 21 -20 -15
x = -14
g) 8 ( x -1 )= 8 - 4 ( 2x -3)
8x -8 = 8 -8x + 12
8x + 8x= 8 +12 +8
16 x = 20 + 8
16 x = 28
x = 28 /16 ( simplifico por 4)
x= 7/4
h) 2 ( x + 5 ) - 3 ( 5 -x )=10
2x +10 -15 +3x =10
2x +3x =10 -10 +15
5x = 0 +15
5x =15
x= 15/5
x= 3
x=