Question

Resolva equaçao 2 graus

Answer 1

7x² - 17x - 12 = 0
Δ= b²-4.a.c 
Δ= (-17)² - 4 . 7 . (-12)
Δ= 625

$\frac{x=-b+- \sqrt{delta} }{2.a}$

$\frac{x=-(-17)+- \sqrt{625} }{2.7}$

$\frac{x=17+-25}{14}$

x1 = $\frac{17+25}{14} = \frac{42}{14} = 3$

x2 = $\frac{17-25}{14} =\ \textgreater \ \frac{-8}{14} =\ \textgreater \ \frac{4}{7}$

S={3 , 4/7}