Question

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Answer 1

Resposta:

1) x= 3 e x= -3

2)x=25 e x=-25

3) x=10 e x=-10

4) x=5 e x=-5

5) x=0 e x=1/3

6) x=0 e x=-2

7) x=0 e x=-3

8) x=0 e x=3

Explicação passo a passo:

1) 9$x^{2}$ = 81

$x^{2}$ = 81/9

$x^{2}$  = 9

$x$ = +- $\sqrt{9\\}$ --- x = +-3

2) 5$x^{2}$ = 3125

$x^{2}$ = 3125/5

$x^{2}$  = 625

x = +-$\sqrt{625}$ --- x = +- 25

3) 10$x^{2}$ = 1000

$x^{2}$ = 1000/10

$x^{2}$  = 100

x = +-$\sqrt{100}$ --- x= +-10

4) 5$x^{2}$ = 125

$x^{2}$ = 25

x = +-5

5) 3x (3x-1) = 0

3x = 0 --- x=0

3x-1=0

3x = 1

x = 1/3

6) x ( x+2) = 0

x=0

x+2=0 --- x = -2

7) x (x+3) = 0

x = 0

x+3 = 0 --- x= -3

8)  3x (x-3) = 0

3x = 0 --- x = 0

x-3 = 0 --- x = 3