(p+q+r)(p-q+r)+pq-qr

Answers 1

Answer:

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

Step-by-step explanation:

(p+q+r)(p-q+r)+pr-qr

Solve (p+q+r)(p-q+r)

p(p-q+r)+q(p-q+r)+r(p-q+r)

(p^2-pq+pr+pq-q^2+qr+pr-qr+r^2)+pq-qr

Now cancel the terms

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

Add the like terms

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

Hope this will help you

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