Question

conta de 3X²=27. de 4X²-36=0. a de X²-4=12

Answer 1

Boa noite Thalita

a)

3x² = 27
x² = 9

x1 = 3,  x2 = -3

b)

4x² - 36 = 0
4x² = 36 
x² = 9

x1 = 3,  x2 = -3

x² - 4 = 12
x² = 16

x1 = 4, x2 = -4

Answer 2

Olá

$a) 3x^{2} = 27$

$x^{2} =\dfrac{27}{3}$

$x = \pm\sqrt{9}$

$x = \pm3$


$b) 4x ^{2} - 36 = 0$

$4x^{2} = 36$

$x^{2} =\dfrac{36}{4}$

$x = \pm\sqrt{9}$

$x = \pm3$


$c) x^{2} - 4 = 12$

$x^{2} = 16$

$x = \pm\sqrt{16}$

$x = \pm4$


Resposta:
$\boxed{S = (\pm3,\pm3,\pm4)}$