Question

Sabendo que x e um numero real,resolva as equacoes sem utilizar a formula de bhaskara.
d)x²-144=o
e)3x²+15=123
f)x²-12=-8
g)x²+121=0

h)x²+41=5

Answer 1

d) $x^{2}$ - 144 = 0
$x^{2}$ = 144
x = $\sqrt{144}$
x = 12

f)$3x^{2}$ + 15=123
$3x^{2}$= 123-15
$3x^{2}$ = 108
$x^{2}$ = 108/3
$x^{2}$ = 36
x = $\sqrt{36}$
x= 6

g) $x^{2}$+ 121 = 0
121= -$x^{2}$
$\sqrt{121}$ = -x
11 = -x
x=-11

h) $x^{2}$ + 41 = 5
41-5 = -$x^{2}$
36 = -$x^{2}$
$\sqrt{36}$ = -x
x= -6