Question

Use the identity (x+a)(x+b)=x^2+(a+b)x+ab to find the following 1. 501*502 2. 95*103

Answer 1

Answer:

a)501×502

=(500) square+(1+2)500+1×2=250000+1500+2=251502

b)95×103=100square+(-5+3)+-5×3

=10000-2-15

=9983