Q. 5 I5.0( 1 Vote )

# Factorize :</

Answer :

Given m2 – 21m – 72

Using (x + a)(x + b) = x2 + (a + b)x + ab … (I)

m2 – 21m – 72 = m2 + ( – 24 + 3)m + ( – 24)×(3)

On comparing with (I),

a = – 24 and b = 3

So, m2 – 21m – 72 = (m – 24)(m + 3)

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