Question

(p-q+r) ^2 +(p-q-r) ^2

Answer 1

Answer:

since a square + b square equal to a plus b ka whole square minus 2 a b.

• since,(p-q+r+p-q-r)^2-2(p-q+r)(p-q-r).

Answer 2

Step-by-step explanation:

we just apply two formula

1. (a-b+c)^2 = a2 +b2 +c2 -2ab -2bc +2ca

AND

2. (a-b-c)^2 = a2 +b2 +c2 -2ab -2bc -2ca