#### notes

For example :

1) 4 × x = x + x + x + x = 4x

2) `5x × 4x^2` = `(5 × 4) × (x × x^2)`

= `20 × x^3 = 20x^3`

Note that : 5 × 4 = 20

i.e., coefficient of product = coefficient of first monomial × coefficient of second monomial;

and `x × x^2 = x^3`

i.e., algebraic factor of product = algebraic factor of first monomial × algebraic factor of second monomial.