Question

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

Answer 1

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

=p^2+q^2+r^2+2pq+2qr+2pr+p^2+q^2+r^2-2pq+2qr-2pr

=2p^2+2q^2+2r^2+4qr

Answer 2

Step-by-step explanation:

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