Question

Quais são as raízes da equação x²-7x+10=0?

Answer 1

$\Delta =( -7)^{2} - 4 . 1 . 10 = 49 - 4. 1 . 10 = 9\\\\ x = \frac{-b +- \sqrt{\Delta} }{2a}\\\\ x' = \frac{-(-7) + \sqrt{9}}{2.1} = \frac{10}{2} = 5\\\\ x'' = \frac{-(-7) - \sqrt{9}}{2.1} = \frac{4}{2} = 2$

As raízes são x' = 5 e x'' = 2.