which of the following is equal to sqrt 18 x^9y^4?
A3x^3y^2
B3 x^4y^2 sqrt 2x
C9 x^3y^2
D3 x^3y^2 sqrt 2
A3x^3y^2
B3 x^4y^2 sqrt 2x
C9 x^3y^2
D3 x^3y^2 sqrt 2