Question

evaluate the following by using a suitable identity:- (85)sq - (75)sq
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Answer 1

Answer:

1600

Step-by-step explanation:

(85)sq - (75)sq

(85+75)(85-75)

160*10

1600

Answer 2

by using identity= (a²- b²)=(a+b)×(a-b)

then,(85²-75²)= (85+75)×(85-75)

= 160×10

= 1600