Q. 2 D3.9( 19 Votes )

# Evaluate the following by using suitable identities:

799^{2}

Answer :

Given: 799^{2} = (800-1)^{2} = (800)^{2}-2(800)(1) + (1)^{2}

= 6400 + 1600 + 1, where a = 800 and b = 1 in the identity (a-b)^{2} = a^{2}-2ab + b^{2}

= 8001

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