Question

Quanto vale x ?
a) x²= 9
b) x²= 25
c) x²= 49
d) x²= 81

Answer 1

Resposta:

a) $x^2=9\quad :\quad x=3,\:x=-3$

b) $x^{2} = 25 : x=5, x=-5$

c) $x^2= 49 : x=7, x=-7$

d) $x^2=81\quad :\quad x=9,\:x=-9$

Answer 2

a) x² = 9 ← =

$x = - 3 \: o \: x = 3$

b) x² = 25 ← =

$x = - 5 \: o \: x = 5$

c) x² = 49 ← =

$x = - 7 \: o \: x =7$

d) x² = 81 ← =

$x = - 9 \: o \: x = 9$