Question

Ajudaaaaa pfvr

Resolva as equações do 2° grau :

a) X2 - 49 = 0

b) 5x2 - 20 = 0

c) 5x2 - 125 = 0

d) x2 - 4x = 0

e) 3x2 - 6 x = 0 ​

Answer 1

a) X² - 49 = 0

x² = 40

x = +-√49

x = +-7

S = {-7,+7}

b) 5x² - 20 = 0

5x² = 20

x² = 20/5

x² = 4

x = +-√4

x = +-2

S = {-2,+2}

c) 5x² - 125 = 0

5x² = 125

x² = 125/5

x² = 25

x = +-√25

x = +-5

S = {+5,-5}

d) x² - 4x = 0

x(x-4) = 0

x = 0

x-4 = 0

x = 4

S = {0,4}

e) 3x²- 6 x = 0

3x(x-6) = 0

3x = 0

x = 0

x-6 = 0

x = 6

S = {0,6}

❤️ Prontinho ❤️

11/09

Answer 2

Resposta:

Explicação passo a passo:

Resolva as equações do 2° grau :

a) X^2 - 49 = 0

X^2 = 49

X = \/49

X = +/- 7

R.: s = {7, -7}

_________________

b) 5x^2 - 20 = 0

5x^2 = 20

X^2 = 20/5

X^2 = 4

X = \/4

X = +/- 2

R.:

S = {2, -2}

___________________

c) 5x^2 - 125 = 0

5x^2 = 125 (:5)

X^2 = 25

X = \/25

X = +/- 5

R.:

S = {5, -5}

________________

d) x^2 - 4x = 0

X.(x-4)= 0

X = 0

X - 4 = 0

X = 4

R.:

S = {0,4}

__________________

e) 3x^2 - 6 x = 0 ​

3.X^2 (:3)= 6x (:3)

X^2 = 6x

X^2 - 6x = 0

X.(x-6)= 0

X = 0

X-6= 0

X = 6

R.:

S = {0,6}