CPM Homework Help : APCALC Problem 3-133

If $f^\prime (x) = −6x^{1/2} − \sin(x)$ , write a possible function for $f$ . Then write another possible equation.

Hint:

Is $f(x)= -4x^{\frac{3}{2}}+\text{cos}x+10$ a solution?

Explain the significance of the $+10$ .