Question

if x-1/x=3 find x²+1/x²​

Answer 1

Answer:

x-1/x=3

Squaring both sides

(x-1/x)²=3²

(x)²+(1/x)²-2×x×1/x=9

x²+1/x²-2=9

x²+1/x²=9+2

x²+1/x²=11