Question

If X2+ 1/x2=7 find the value of x3+ 1/x3

Answer 1

Answer....✌️

=x³+1/x³

= (x+1/x)(x²+1/x²-1(x/x)

=(x+1/x)(7-1)

=6(x+1/x)...................................(1)

now

x²+1/x²=7

(x+1/x)²-2=7

(x+1/x)=√9

x+1/x=9

put this value in eqn 1

6(9)

=36

HOPE THIS HELP YOU.....

MARK AS BRAINLIEST.....✌️✌️