Question

15 - if a3 + 3a2 + 9a = 1, then what is the value of a3 + (3/a)?

Answer 1

Step-by-step explanation:

a3+3a2+9a =1

3a+6a+9a=1

18a=1

a=1/18

a3+3/a=

1/18×3 + 3/1/18=

1/6 + 18×3/1=

1/6 + 54= lcm= 6

1/6 + 54×6/1×6

1/6 + 324/6 =

1+324/6 = 125/6