Question

Expand the squares of the following trinomials 1-x+1/x​

Answer 1

Answer:

[(1-x)+1/x]²==(1-x)²+(1/x)²+2.(1-x).1/x=(1+x²-2x)+1/x²+2/x-2=(x²+1/x²)+(2/x-2x)-1