Question

Resolva as equações a seguir

Answer 1

Explicação passo-a-passo:

a) 18x - 43= 65

18x= 65 + 43

18x= 108

x= 108/18

x= 6

b)23x - 16= 14 - 17x

23x + 17x= 14 + 16

40x= 20

x= 20/40

x= 1/2

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

10y -5 -5y= 6y - 6 - 20

10y - 5y - 6y= - 6 - 20 + 5

5y - 6y= -26 + 5

-y= -21

y= 21

d) x( x + 4) + x( x + 2)= 2x² + 12

x² + 4x + x² + 2x= 2x² + 12

x² + x² - 2x² + 4x + 2x= 12

2x² - 2x² + 6x= 12

6x= 12

x= 12/6

x= 2

e) (x - 5)/10 + ( 1 - 2x)/5= (3 - x)/4

x/10 - 5/10 + 1/5 - 2x/5= 3/4 - x/4

x/10 - 2x/5 + x/4= 3/4 + 5/10 - 1/5

2x/20 - 8x/20 + 5x/20= 15/20 + 10/20 - 4/20

-6x/20 + 5x/20= 25/20 - 4/20

-x/20= 21/20

x/20= -21/20

20x= 420

x= 420/20

x= 21