Question

04. Resolva:
a) 3x² - 48 = 0
b) 2x² + 6x = 0
c) 7x² = 14x
d) 4x² - 36 =0​

Answer 1

Resposta:

(x^2 significa x elevado a 2)

a) x^2 - 16= 0

x^2=16

x1=4

x2=-4

_____

b)2x² + 6x = 0

x^2-3=0

x^2=3

$x = \sqrt{3}$

$x 1= \sqrt{ - 3}$

$x2 = \sqrt{3}$

______

c) 7x² = 14x

x^2=2

$x = \sqrt{2}$

$x1 = \sqrt{2}$

$x2 = \sqrt{ - 2}$

______

d) 4x² - 36 =0

x^2-9=0

x^2=9

×1=9

×2=-9