Question

Resolva as equações do 2 grau no universo R

a) x² = 16

b) 11x² = 396

c) 2( x²- 5)² - 50 = 0

d) 5x² - 20 = 0

e) 7x² - 196 = 0

Answer 1

Resposta:

a) x² = 16

x = 16

b) 11x² = 396

121x = 396

$x = \frac{396}{121}$

c) 2 (x² - 5)² - 50 = 0

2 (x - 5)² - 50 = 0

2x - 5² - 50 = 0

2x - 25 - 50 = 0

2x = 0 + 25 + 50

2x = 75

$x = \frac{75}{2}$

d) 5x² - 20 = 0

25x - 20 = 0

25x = 0 + 20

25x = 20

$x = \frac{20}{25}$

e) 7x² - 196 = 0

49x - 196 = 0

49x = 0 + 196

49x = 196

$x = \frac{196}{49}$

x = 4

Espero ter ajudado!