if a+1/a=30 so a2+1/a2=?
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a+1/a=30
=>(a+1/a)^2 =30^2
=>a^2 +2.a.1/a+1/a^2 =900
=>a^2 +2+1/a^2 =900
=>a^2 +1/a^2 =900-2
So,a^2 +1/a^2 =898
=>(a+1/a)^2 =30^2
=>a^2 +2.a.1/a+1/a^2 =900
=>a^2 +2+1/a^2 =900
=>a^2 +1/a^2 =900-2
So,a^2 +1/a^2 =898
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