Question

Preciso das respostas para um trabalho (FÓRMULA DE BHÁSKARA)
X+X2=90
X2+x2=12
X2-2x=-12
X2-2x=80

Answer 1

$x + x {}^{2} = 90 \\ x {}^{2} + x - 90 = 0 \\ delta = 361 \\ x = \frac{ - 1 + - \sqrt{361} }{2} \\ x = \frac{ - 1 + - 19}{2} \\ x1 = \frac{ - 1 + 19}{2} \\ x1 = \frac{18}{2} = 9 \\ x2 = \frac{ - 1 - 19}{2} \\ x2 = \frac{ - 20}{2} = - 10$
$x {}^{2} + x {}^{2} = 12 \\ 2x {}^{2} = 12 \\ x {}^{2} = \frac{12}{2} \\ x {}^{2} = 6 \\ x = + - \sqrt{6}$
$x {}^{2} - 2x = - 12 \\ x {}^{2} - 2x + 12 = 0 \\ delta = - 40 \: nao \: existe$
$x {}^{2} - 2x - 80 = 0 \\ delta = 324 \\ x = \frac{2 + - 18}{2} \\ x1 = 10 \\ x2 = 8$