Question

If a+9/a=3 find 3a³-81​

Answer 1

Answer:

a+9/a=3

a+9=3a

9=3a-a

9=2a

a=9/2. (1)

3a³-81. (2)

a ka man smi (2) me rakhane par

3(9/2)³-81

3(729/8)-81

2187/8-81

(2187-81×8)/8

(2187-648)/8

1539/8

192.37