Question

9) Encontre os zeros da função:

y = x² -5x + 6

Answer 1

$\Delta =b^{2} -4ac=( -5)^{2} -4\cdotp 1\cdotp 6=1 \\ \\ x=\frac{-b\pm \sqrt{\Delta }}{2a} =\frac{5\pm 1}{2\cdotp 1} \Longrightarrow x=2\lor x=3\\ \\ \therefore \boxed{\boxed{S=\{x\in \mathbb{R} |x=2\lor x=3\}}}$