Question

Resolva a equação√X²- 4 = √5

Answer 1

Oie, Td Bom?!

$\sqrt{x {}^{2} - 4 } = \sqrt{5}$

$\sqrt{x {}^{2} - 4} {}^{2} = \sqrt{5 {}^{2} }$

$x {}^{2} - 4 = 5$

$x {}^{2} = 5 + 4$

$x {}^{2} = 9$

$x = ± \sqrt{9}$

$x = ±3$

$S = \left \{- 3 \: , \: 3\right \}$

Att. Makaveli1996