Question

Find the value of ,405×408 using the identity

Answer 1

Answer:

165240

Step-by-step explanation:

1) (400 + 5) (400 + 8)

2) Using (x + a) (x + b) = x² + (a + b)x + ab Identity.

3) (400)² + (5 + 8)400 + (5 × 8) = 160000 + 5200 + 40.

4) 165240.

Answer 2

Answer:

165240

Step-by-step explanation:

Distributive identity states-

x*105=x*100+x*5

Using this property,

405*408=405*100+405*100+405*100+405*100+405*8

=40500+40500+40500+40500+3240=4*40500+3240

=162000+3240=165240

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