Question

Sendo x1 e x2 as raízes da equação f(x)=2x²-14x+24, qual o valor de x1 + x2 e x1 . x2, respectivamente?

Answer 1

$\Large\boxed{\begin{array}{l}\sf f(x)=2x^2-14x+25\\\sf x_1+x_2=-\dfrac{b}{a}\\\\\sf x_1+x_2=-\dfrac{-14}{2}=7\\\\\sf x_1\cdot x_2=\dfrac{c}{a}\\\\\sf x_1\cdot x_2=\dfrac{24}{2}\\\\\sf x_1\cdot x_2=12\end{array}}$