Question

evaluate 82×85 without multiplying directly
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Answer 1

Answer:

1) 82×58

= (80+2)(80+5)

= Using, (x+a)(x+b)= x^2+x(a+b)+ab

= (80)^2+80(2+5)+2×5

= 6400+560+10

=6970

Here is your answer.....hope it helps