Question

Using some algebraic identity, evaluate the following :
$503 \times 495$
​

Answer 1

Answer:

[500+3] [500+(-5)]

using identity:-(x+a)(x+b)

x2+(a+b)x+ab

here x=500 a=3 and b=-5

=(500)^2 +(3+(-5))500+3*(-5)

=250000+(3-5)500-15

=250000+(-2)500-15

=250000-1000-15

=249000-15

=248985

Answer 2

Answer:

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