Respostas

2013-10-29T22:36:31-02:00
X.(x-13)=300
 x^{2} -13x=300
 x^{2} -13x-300=0
(-13) ^{2}-4.1.(-300)
169+1200
1369
x= \frac{-(-13)+- \sqrt{1369} }{2.1}
x= \frac{13+-37}{2}
x'= \frac{13+37}{2}
x'= \frac{50}{2}
x'=25 m
x''= \frac{13-37}{2}
x''= \frac{-24}{2}
x''=-12 (nao convem)
area do retangulo
b.h
largura=25m
base=25-13
base=12
a=12.25
a=300 m²
a base tem 12 metros e a largura tem 25 metros
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