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Solve the question:(i) 15pq + 15 + 9q + 25p(ii) z − 7 + 7xy − xyz |
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Answer» (i) 15pq + 15 + 9q + 25p = 15pq + 9q + 25p + 15 = 3 × 5 × p × q + 3 × 3 × q + 5 × 5 × p + 3 × 5 = 3q (5p + 3) + 5 (5p + 3) = (5p + 3) (3q + 5) (ii) z − 7 + 7xy − xyz = z − x × y × z − 7 + 7 × x × y = z (1 − xy) − 7 (1 − xy) = (1 − xy) (z − 7) |
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