if x^2+1/×^2=7 then find the value of x^3+1/x^3
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x^2+1/x^2=7.
=>x^2+1/x^2+2.x.1/x=7+2=9
=>(x+1/x)=3.
=>x^3+1/x^3=(x+1/x)(x^2+1/x^2-1)
=(3)(7-1)=18.
=>x^2+1/x^2+2.x.1/x=7+2=9
=>(x+1/x)=3.
=>x^3+1/x^3=(x+1/x)(x^2+1/x^2-1)
=(3)(7-1)=18.
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