Question

Ache as raízes da função do 2 grau y=x²-15x+56

Answer 1

$+ 15 ± \frac{ \sqrt{ {15}^{2} - 4 \times 1 \times 56 } }{2 \times 1}$
$\frac{15 + 1}{2} = x \alpha$
$\frac{15 - 1}{2} = x \beta$
$x \alpha = 8 \ \: \: e \: \: \: x \beta = 7$