Question

resolva as equações:

a) 3+x=0
b)23x+2=2
c)12-7+4x=25
d)5x-3x=30
e)4x+10=45-3x
f)5. (9+y)=20-3+6y
g)2x (4-3x)=2

me ajudem por favor

Answer 1

Explicação passo-a-passo:

a) x = - 3

b) 23x = 2 -2

23x = 0

x= 0/23

x= 0

c) 5 +4x = 25

4x = 25 - 5

4x = 20

x= 20/4

x= 5

d) 2x = 30

x= 30/2

x= 15

e) 4x +3x = 45 - 10

7x = 35

x = 35/7

x= 5

f) 45 +5y = 17 +6y

5y - 6y = 17 - 45

- 1y = - 28

y = - 28/-1

y= +28

g) 8x - 6x² = 2

- 6x² +8x - 2=0

6x² - 8x +2=0

3x² - 4x +1=0

∆= (-4)² -4.3.1

∆= 16 - 12

∆= 4

x = - (-4) ±√4/2.3

x= 4 ±2/6

x1= 4+2/6= 6/6=1

x2= 4-2/6= 2/6= 1/3

S = { 1/3, 1 }