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2013-10-01T20:51:12-03:00
(x+8).(x+2)
 x^{2} +2x+8x+16
 x^{2} +10x+16=0
 10^{2}-4.1.16
100-64
36
x= \frac{-10+- \sqrt{36} }{2.1}
x= \frac{-10+-6}{2}
x'= \frac{10+6}{2}
x'= \frac{16}{2}
x'=8
x''= \frac{-10-6}{2}
x''= \frac{-16}{2}
x''= -8  
b)(x-2).(x+2)
 x^{2} +2x-2x-4
 x^{2} -4
 x^{2} =4
x= \sqrt{4}
x=2
3 4 3
Brigadinhoo Ai Wandersonoliveira
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