Question

Evaluate using identity ​

Answer 1

Answer:

1,52,775

Explanation:

This is the Ans third class student can multiply thus

Answer 2

Answer:

152775

Explanation:

485×315 can be written as (500-15)×(300+15) which can also be written as [15+470]×(15+300)

Now, using the identity (x+a)(x+b) = x² + (a+b)x + ab

x = 15

a = 470

b = 300

x² + (a+b)x + ab = 15² + [(470 + 300)*15] + (470×300)

= 225 + (770×15) + 141000

= 225 + 11550 + 141000

= 152775

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