Question

factorise a^2-4a-21 please tell fast

Answer 1

here is ur answer dear ❤

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Answer 2

Answer:

(a-7) (a+3)

Step-by-step explanation:

a^2-4a-21

a^2-(7a-3a)-21

a^2-7a+3a-21

a (a-7) 3 (a-7)

(a-7) (a+3)