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प्रश्न
Verify the following:
(p – q)(p2 + pq + q2) = p3 – q3
योग
उत्तर
Taking L.H.S. = (p – q)(p2 + pq + q2)
= p(p2 + pq + q2) – q(p2 + pq + q2)
= p3 + p2q + pq2 – qp2 – pq2 – q3
= p3 – q3
= R.H.S.
Hence verified.
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अध्याय 7: Algebraic Expression, Identities and Factorisation - Exercise [पृष्ठ २३८]
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