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2014-08-30T11:15:50+03:00
A+1/a=4
a^2+1/a^2= (a+1/a)^2- 2*a*1/a=(a+1/a)^2-2= 4^2-2=16-2=14
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2014-08-30T11:16:14+03:00
A+ 1/a=4 |²

(a+1/a)²=16

a²+2*a+1/a +1/a²=16

a² +1/a²=16 -2

a² +1/a² =14
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