Respostas

2013-12-11T19:05:59-02:00
A = 1
b = 10
c = 25

Δ = b² - 4.a.c
Δ = 10² - 4.1.25
Δ = 100 - 100
Δ = 0

x= \frac{-b\±\sqrt{\Delta} }{2.a}\\\\x= \frac{-10\± \sqrt{0} }{2.1} \\\\\boxed{x'=-5}\\\\\boxed{x''=-5}

Beleza..ArianeGostosona!   ;)