Question

Verify pq = qp for p = - 1/2, q = 2/5

Answer 1

Answer:

Given (P−Q)(P−Q)=P

2

−Q

2

L.H.S

(P+Q)(P−Q)=P

2

−PQ+QP−Q

2

If PQ=QP⇒(P+Q)(P−Q)=P

2

−Q

Answer 2

Answer:

pq = qp

- 1/2×2/5 = 2/5×- 1/2

- 1/5 = - 1/5

Hence, verified that pq = qp