if x3+ 1/x3 is equal to 110 then x+1/ x is equal to
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(x+1/x)^3=x3+1/x3+3x×1/x×(x+1/x)
x3+1/x3=(x+1/x)3-3×(x+1/x)-----(1)
let a=x+1/x
equation 1 becomes
110=a3-3a
on simplification we get a=5
hence, x+1/x=5
x3+1/x3=(x+1/x)3-3×(x+1/x)-----(1)
let a=x+1/x
equation 1 becomes
110=a3-3a
on simplification we get a=5
hence, x+1/x=5
abd12:
how is that equation 1st came
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