Question

Calcule as raízes
a)
$9x {}^{2} - 16 = 0$
b)
${x}^{2} - 4 = 0$

Answer 1

9x² - 16 = 0

9x² = 16

V(9x² ) = +-V16

3x = +-4

x = +-4/3 ***

b

x² - 4 = 0

x² = 4

Vx²  = +-V4

x = +-2 ****