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is the answer. ................
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anithachoudhary:
u have written in pencil. nthg is visible
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Given Equation is (p^2 - q^2) - 2qr - r^2
= > p^2 - q^2 + pq - pq + pr - pr - qr - qr - r^2
= > p^2 + pq + pr - pq - q^2 - qr - pr - qr - r^2
= > p(p + q + r) - q(p + q + r) - r(p + q + r)
= > (p + q + r)(p - q - r).
Hope it helps!
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