Q. 5 H5.0( 1 Vote )

Evaluate the following by using the identities:

28 × 32

Answer: 896

Answer :

28 × 32= (30 – 2) (30 + 2)


We know that


(a2 – b2) = (a – b) × (a + b)


(30 – 2) (30 + 2) = (30)2 – (2)2


(30 – 2) (30 + 2) = 900 – 4 = 896


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