Q. 5 F5.0( 1 Vote )

Evaluate the following by using the identities:

53 × 47

Answer :

53 × 47 = (50 + 3) (50 – 3)


We know that


(a2 – b2) = (a – b) × (a + b)


(50 + 3) (50 – 3) = (50)2 – (3)2


(50 + 3) (50 – 3) = 2500 – 9 = 2491


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