We'll integrate by parts. For this reason, we'll consider
the formula:
Int udv = u*v - Int vdu
(*)
We'll put u = 5x.
(1)
We'll differentiate both
sides:
du =5 dx (2)
We'll put
dv = e^2x (3)
We'll integrate both
sides:
Int dv = Int e^3x
dx
v = e^2x/2 (4)
We'll
substitute (1) , (2) , (3) and (4) in (*):
Int udv =
5x*e^2x/2 - 5Int (e^2x/2)dx
Int (5x*e^2x)dx
= 5x*e^2x/2 - 5*e^2x/4 + C
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