Question

Calcule as raízes reais para a função y = x2 – 5x + 6:

Answer 1

Olá!

y = x² – 5x + 6

a = 1   ,   b = – 5     ,     c = 6

$\dfrac{-b\pm\sqrt{b^{2}-4\cdot a\cdot c} }{2\cdot a}~~~\to~~~\dfrac{-(-5)\pm\sqrt{(-5)^{2}-4\cdot 1\cdot 6} }{2\cdot 1}~~~\to ~~~\dfrac{5\pm\sqrt{1} }{2} ~~~\to ~~~\dfrac{5\pm1}{2} \\ \\ \\ \\ \boxed{x'=3~~~e~~~x''=2}$

:)