Question

Factorise fully 21a - 7a2

Answer 1

Answer: The factors are : 7a , (3-a)

Step-by-step explanation: 21a - 7a2

7×3×a - 7×a×a

= The common factor = 7a

∴7a(3 - a)

∴ The factors are : 7a, (3-a)

Answer 2

In both 21a and 7a^2, we can see that both terms contain an 'a' and a number that is divisible by 7.

7a(3 - a)

Hope this helps! :)