Question

Faça essa conta : X elevado a 2 +7x +12 =0

Answer 1

$x {}^{2} + 7x + 12 = 0 \\ \\ \\ x = \frac{ - 7± \sqrt{7 {}^{2} - 4 \times 12 \times 1} }{2 \times 1} \\ \\ \\ x = \frac{ -7 ± \sqrt{1} }{2} \\ \\ x = \frac{ - 7±1}{2} \\ \\ x' = \frac{ - 7 + 1}{2} = \frac{ - 6}{2} = - 3 \\ \\ x'' = \frac{ - 7 - 1}{2} = \frac{ - 8}{2} = - 4 \\ \\ \\ S = [ - 4, \: - 3]$