Question

raizes reais da funcao quadratica Y =x² -4x-12

Answer 1

Olá!

Para encontrar as raízes basta utilizar a fórmula de Bháskara.

$\dfrac{-b\pm\sqrt{b^{2}-4\cdot a \cdot c} }{2\cdot a}~~~\to ~~~\dfrac{-(-4)\pm\sqrt{(-4)^{2}-4\cdot 1 \cdot (-12)} }{2\cdot 1}~~~\to ~~~\dfrac{4\pm\sqrt{64} }{2} \\ \\ \\ \dfrac{4\pm8}{2} ~~~\to ~~~\boxed{x'=6~~~e~~~x''=-2}$

Resposta:

Raízes: x' = 6  e x'' = -2

:)