Plz help me show work four points correctly evaluate the function for the given value showing all work HELP PLZ

f(4)=36
Step-by-step explanation:
f(x)=x^2+5x
f(4)=??
you need to put the number 4 instead of x in the equation.
f(4)=(4)^2+(5×4)
f(4)=16+20
f(4)=36