Question

Resolva:

a- 8-3x=0

b- x (x-10)=0

c- x (2x+8)=0

d- (x+2) (3x-10)=0

e- (x-5) (5x+20)=0

f- (2x-3) (2x+3)=0

Answer 1

Resposta:

Explicação passo-a-passo:

Resolva:

a-

8-3x=0

- 3x = - 8

x = - 8/-3   o SINAL

x = + 8/3

x = 8/3

b-

x (x-10)=0

x = 0

e

(x - 10) = 0

x - 10 = 0

x =+ 10

assim

x' = 0

x'' = 10

 

c- x (2x+8)=0

x( 2x + 8) = 0

x = 0

e

(2x + 8) = 0

2x + 8 = 0

2x = - 8

x = - 8/2

x = - 4

assim

x' = 0

x'' = - 4

d- (x+2) (3x-10)=0

(x + 2)(3x -10) = 0

(x + 2) = 0

x + 2 = 0

x = - 2

e

(3x - 10) = 0

3x - 10 = 0

3x = + 10

x = 10/3

assim

x' = - 2

x'= 10/3

e- (x-5) (5x+20)=0

(x - 5)(5x + 20) = 0

(x - 5) = 0

x - 5 = 0

x = + 5

e

(5x + 20) = 0

5x + 20 = 0

5x = - 20

x = - 20/5

x = - 4

assim

x' = 5

x'' = - 4

f- (2x-3) (2x+3)=0

(2x - 3)(2x + 3) = 0

(2x - 3) = 0

2x - 3 = 0

2x = + 3

x = 3/2

e

(2x + 3) = 0

2x + 3 = 0

2x = - 3

x = - 3/2

assim

x' = 3/2

x''  -  3/2