Question

x²+5x-9=0 resolva a equaçao=ur

Answer 1

$\mathtt{x^2 + 5x-9 = 0} \\ \\ \mathtt{a = 1} \\ \mathtt{b = 5} \\ \mathtt{c = -9} \\ \\ \mathtt{\Delta =b^2 -4 \times a \times c } \\ \mathtt{\Delta = 5^2 -4 \times 1 \times (-9)} \\ \mathtt{\Delta = 25 + 36 } \\ \mathtt{\Delta = 61 } \\ \\ \mathtt{\frac{-b +- \sqrt{\Delta} }{2 \times a }} \\ \\ \mathtt{\frac{-5 +- \sqrt{61} }{2 \times 1 }} \\ \\ \boxed{\mathtt{\frac{-5 +- \sqrt{61} }{2 }} }} \\ \\ \\ \underline{\mathtt{Resposta}}$
$\boxed{-\frac{ \sqrt{61}+ 5 }{2 }} ~~~~~e~~~~ \boxed{\frac{ \sqrt{61}- 5 }{2 }}$