Question

Show that the number 621×42+45×42 is a composite number

Answer 1

621×42+45×42

=42(621+45)

=42×666

it is the product of two composite no.

therefore, it is a composite number

Answer 2

Step-by-step explanation:

a number which has atleast three factors (including 1 and number itself) is called composite numbers.

621*42+45*42

42(621+45)

42*666

so,the given number has already more than 3 factors viz. 1,42,666 so it has to be composite number...