Q. 1 D5.0( 1 Vote )

Choose the correct answer for the following:

The factors of 169l2 – 441m2 are ________
A. (13l – 21 m), (13l – 21m)

B. (13l + 21 m), (13l + 21m)

C. (13l – 21 m), (13l + 21m)

D. 13(l + 21 m), 13(l – 21m)

Answer :

Given 169l2 – 441m2


(a2 – b2) = (a – b) × (a + b)


169l2 – 441m2 = (13l)2 – (21m)2


169l2 – 441m2 = (13l – 21m)(13l + 21m)


The factors of 169l2 – 441m2 are (13l – 21m) and (13l + 21m).

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