Question

for solving for particular equations, what does the p(a) represent in these simple formulas?

for f(x)=ce^(ax)
1) yparticular= (c*e^(ax))/(p(a))
2) yparticular= (c*x*e^(ax))/(p'(a))
3) yparticular= (c*x^2*e^(ax))/(p''(a))