4. Polynomial Functions

Determine which functions are polynomial functions. For those that are, identify the degree. $f\left(x\right)=x^{\frac{1}{2}}-3x^2+5$

Find the zeros of the given polynomial function and give the multiplicity of each. State whether the graph crosses or touches the x-axis at each zero. $f\(\left\)(x\(\right\))=2x^4-12x^3+18x^2$

Graph each polynomial function. Factor first if the polynomial is not in factored form. ƒ(x)=x²(x-5)(x+3)(x-1)