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factorise completely
21a^2-28ab


Sagot :

Answer:

7a(3a-4b)

Step-by-step explanation:

21a^2-28ab

Find what each pair has in common, in this case 21a^2 and 28ab are both divisible by 7a.

Factor out 7a to get 7a(3a-4b) and there’s your solution!