Q. 4 A5.0( 1 Vote )
Compute the following differences:
(125 × 75) – (126 × 74)
Answer :
(125 × 75) can be written as (100+25)(100-25)
using identity 
- 
(100+25)(100-25) = 
- 
= 10000 - 625
= 9375
now (126 × 74) can be written as (100+26)(100-26)
using identity 
- 
(100+26)(100-26) = 
- 
= 10000 - 676
= 9324
now putting values in question
(125 × 75) – (126 × 74) = 9375-9324
= 51
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