Question

How do you factor `7a^3 - 21a^2`?

Answer 1

`7a^2 (a - 3)`

Explanation:

`7a^3 - 21a^2`

= `7.a.a.a - 7.3.a.a`

= 7.a.a (a - 3)

= `7a^2 (a-3)`