Math, asked by ak7123456789amankuma, 9 months ago

factorize
9a^2-12a-21

plz help me out fast

Answers

Answered by turkirozy
1

Step-by-step explanation:

hope it will help you............

Attachments:
Answered by ksonakshi70
0

Answer:

9 {a}^{2}  - 12a - 21 = 0 \\ 3(3 {a}^{2}  - 4a - 7) = 0 \\ 3 {a}^{2}   + 3a - 7a - 7 = 0 \\ 3a(a  + 1) - 7(a + 1) = 0 \\ 3a  - 7 = 0 \:  \:  \:  \:  \:  \:  \:  \: a + 1 = 0 \\ a =  \frac{7}{3}  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: a =  - 1

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