Question

8) Calcular as raízes da equação do segundo grau X2 – 12X + 35 = 0

Answer 1

$\Delta =b^{2} -4ac=( -12)^{2} -4\cdotp 1\cdotp 35=4 \\ \\ x=\frac{-b\pm \sqrt{\Delta }}{2a} =\frac{12\pm 2}{2\cdotp 1} \Longrightarrow x=5\lor x=7 \\ \\ \therefore \boxed{\boxed{S=\{x\in \mathbb{R} |x=5\lor x=7\}}}$