Question

hii..pls solve que 7

Answer 1

HEY Buddy.....!! here is ur answer

Given that x³+1/x³ = 110

As we know that... a³+b³ = (a+b)³–3ab(a+b)

Here, a = x and b = 1/x

x³+1/x³ = (x+1/x)³–3x.1/x(x+1/x)

=> x³+1/x³ = (x+1/x)³–3(x+1/x)

=> 110 = (x+1/x)³–3(x+1/x)

Here we have to apply the option.....

On taking 5 as first Option....

On taking (x+1/x) = 5

=> 110 = (5)³–3×5

=>110 = 125–15

=> 110 = 110

L.H.S. = R.H.S.

Therefore the value of (x+1/x) = 5 <<< Ans.

I hope it will be helpful for you.....!!

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