Question

Resolva a equação 2x²-18=0

Answer 1

$x = \frac{ - b + - \sqrt{ {b}^{2} - 4ac } }{2a}$

$x = \frac{ - 0 + - \sqrt{ {0}^{2} - 4.2 - 18} }{2.2}$

$x = \frac{ 0 + - \sqrt{0 + 144} }{4}$

$x = \frac{ 0 + - \sqrt{144} }{4}$

$x = \frac{0 + - 12}{4}$

$x1 = \frac{0 - 12}{4}$

$x1 = \frac{ - 12}{4}$

x' = - 3

$x2 = \frac{0 + 12}{4}$

$x2 = \frac{12}{3}$

x'' = 3

S = { - 3 , 3 }