Question

Please answer
It's very urgent!!!!​

Answer 1

(x+1/x)²=x²+1/x²+2*x*1/x

(x+1/x)=√83+2 because in 2*x*1/x , x will cut 2 will remain

now(x+1/x)=√85

(x-1/x)³= x³-1/x³-3*x*1/x(x-1/x)

(√85)³=x³-1/x³-3(√85)

now, x³-1/x³=(√85)³+3√85

=783.66+27.65

= Ans 811.31