$$\\f(x)= 3x^3-x^2-\frac{2x}{x}(x+1)^2\\
x\ne0\\
f(x)= 3x^3-x^2-2(x+1)^2\\$$
https://www.desmos.com/calculator/yqeohffxtx
Zero is approximately x=1.891
domain: x in the set ot reals where x is not equal to 0
$$\\f(x)= 3x^3-x^2-\frac{2x}{x}(x+1)^2\\
x\ne0\\
f(x)= 3x^3-x^2-2(x+1)^2\\$$
https://www.desmos.com/calculator/yqeohffxtx
Zero is approximately x=1.891
domain: x in the set ot reals where x is not equal to 0