Question

Resolva as equações do 1° Grau:

a) -3(3x-42)=2(7x-52)

b) 23x-16=14-17x

c) 10y-5(1+y)=3(2y-2)-20

d) x(x+4)+x(x+2)=2x²+12

Answer 1

a) -3(3x-42)=2(7x-52)
-9x+126= 14x-104
-9x-14x= -104-126
-23x= -230
x= -230 / -23
x= 10

b) 23x-16=14-17x
23x+17x= 14+16
40x= 30
x= 30/40

c) 10y-5(1+y)=3(2y-2)-20
10y-5-5y= 6y-6-20
5y-6y= -6-20+5
-y= 21
y= -21

d) x(x+4)+x(x+2)=2x²+12
x²+4x+x²+2x= 2x²+12
x²+4x+x²+2x-2x²=12
6x=12
x= 12/6
x=2