Math, asked by somit123ghosh, 7 months ago

(a + 3) (a - 3) (a+ 9)​

Answers

Answered by 0407765
0

Answer:

Step-by-step explanation:

a(a2+3a+9)=1  , so a2+3a+9=1/a. Thus, 3a=3a2+9a+27. So we have that a3+3a=a3+3a2+9a+27. However, by the original equation we have that a3+3a2+9a=1, so a3+3a2+9a+27=28, and we are done.

Motivation: The a3+3/a does not look very nice, so you want to isolate the 3/a somehow. This is a common technique in contests

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