Simplify (x+ 3/x)(x^ 2 -3+ 9 x^ 2 )

Answer 1

(x+ 3/x)(x^ 2 -3+ 9 x^ 2 )
(x+ 3/x)(10x^2 - 3)
x(10x^2) - x(3) + (3/x)(10x^2) - (3/x)(3)
now finish it off

Answer 2

(x+ 3/x) (10 x^ 2 -3 )
(1/x) (x^2+ 3) (10 x^ 2 -3 )
(1/x) (10 x^4 + 27x^2 - 9 )
10 x^3 + 27 x - 9/x