Question

resolva a fórmula de Baskara
me ajudeemmm por favorr​

Answer 1

$x {}^{2} + x + 1 - 21 = 0 \\ x {}^{2} + x - 20 = 0 \\ \\ Δ = b {}^{2} - 4ac \\ Δ = 1 {}^{2} - 4.1.( - 20) \\ Δ = 1 + 80 \\ Δ = 81 \\ \\ x = \frac{ - b + - \sqrt{delta} }{2.a} \\ x = \frac{ - 1 + - \sqrt{81} }{2.1} \\ x = \frac{ - 1 + - 9}{2} \\ x {}^{1} = \frac{ - 1 + 9}{2} \\ x {}^{1} = \frac{8}{2} \\ x {}^{1} = 4 \\ x {}^{2} = \frac{ - 1 - 9}{2} \\ x {}^{2} = \frac{ - 10}{2} \\ x {}^{2} = - 5$