Question

Evaluate using identities 89×87

Answer 1

Hey!!! Here's your answer

89×87

=(85+4)(85+2)

By (x+a)(x+b)=x^2+(a+b)x+(ab)

89×87=85^2+6×85+8

89×87=7225+510+8

89×87=7743

Hope it helps you...

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