Question

fast math pls urgent

Answer 1

4

Step-by-step explanation:

Given, x²+1/x²=18

=> x²+1/x²=2+16

=> x²+1/x²-2=16

In the form of an algebraic identity,

(x)²+(1/x)²-2(x)(1/x)=16

=>(x-1/x)²=16 [x²+y²-2xy=(x-y)²]

=>(x-1/x)=√16

=) (x-1/x)=4