Question

Resolva as equações abaixo

a) 7× + 14 = 3× + 20

b) -8× + 40 = 3 ( 2× + 5 )

c) -5 ( 2× + 8 ) = -10 ( 2× + 5 )

d) -4 ( -2× + 10 ) = -20 ( -2× + 3 )​

Answer 1

Resposta:

a) 7x+14=3x+20

7x-3x=20-14

4x=6

x=6÷4

R: seis quartos 6/4

b)-8x+40=3(2x+5)

-8x+40=6x+15

-8x-6x=15-40

-14x=-25 (-1)multiplica a equação por -1

14x=25

x=25÷14

R: 25/14

c)-5(2x+8)=-10(2x+5)

-10x-40=-20x-50

-10x+20x=-50+40

+10x=-10

x=-10÷10=-1

R:-1

d)-4(-2x+10)=-20(-2x+3)

+8x-40=+40x-60

8x-40x=-60+40

-32x=-20 (-1)

32x=20

x=20÷32 simplifica por 4

x=5/8

R:5/8

Answer 2

a)

7x+14=3x+20

7x-3x=20-14

4x=6

x=6%4

R: 6/4