Question

2) Quanto vale x ?

a) x2= 9

b) x2= 25

c) x2= 49

d) x2= 81

Answer 1

Oie, Td Bom?!

a)

$x {}^{2} = 9$

$x = ± \sqrt{9}$

$x = ±3$

b)

$x {}^{2} = 25$

$x = ± \sqrt{25}$

$x = ±5$

c)

$x {}^{2} = 49$

$x = ± \sqrt{49}$

$x = ±7$

d)

$x {}^{2} = 81$

$x = ± \sqrt{81}$

$x = ±9$

Att. Makaveli1996