Question

Resolva no conjunto r
X2+2x=3

Answer 1

x² + 2x = 3

x² + 2x - 3 = 0

∆ = 2² - 4.1.(-3)

∆ = 4 + 12

∆ = 16

$x = \frac{ - 2 + - \sqrt{16} }{2 \times 1}$

$x = \frac{ - 2 + - 4}{2}$

$x = \frac{ - 2 + 4}{2} \\ x = \frac{ - 2 - 4}{2}$

$x1 = 1 \\ x2 = - 3$