Question

02- quais são as raízes da função f(x) = x²-7x+10 -2 e -5 5 e 2 5 e 5 3 e 4 ​

Answer 1

As raízes são x = 2 e x = 5.

$\Delta =b^{2} -4ac=( -7)^{2} -4\cdotp 1\cdotp 10=9 \\ \\ x=\frac{-b\pm \sqrt{\Delta }}{2a} =\frac{7\pm 3}{2\cdotp 1} \Longrightarrow x=2\lor x=5 \\ \\ \therefore \boxed{\boxed{S=\{x\in \mathbb{R} |x=2\lor x=5\}}}$