Question

Find the value of $(998\times 1002)$ using formula.

Answer 1

Given: $998\times 1002$

$=(1000-2)(1000+2)$

$={1000}^2-2^2$...... $\left[As\right(a+b\left)\right(a-b)=(a^2-b2\left)\right]$

$=999996$