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in Factorization by (49.3k points)
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Factorise:

(m + a) (n - b) - (m + b) (n - a)

(a) (a - b) (m - n)

(b) (a + b) (m - n)

(c) (a - b) (m + n)

(d) (a - b) (m - n)

1 Answer

+1 vote
by (48.2k points)
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Best answer

Correct option is (c) (a - b) (m + n)

(m + a) (n − b) − (m + b) (n − a)

⇒ (mn + na − mb − ab) − (mn + nb − ma − ab)

⇒ mn + na − mb − ab − mn − nb + ma + ab

⇒ na − nb + ma − mb

⇒ n(a − b) + m(a − b)

⇒ (a − b) (m + n)

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