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This is a differential equations problem: use variation of parameters to find the general solution to...

This is a differential equations problem:

use variation of parameters to find the general solution to the differential equation given that y_1 and y_2 are linearly independent solutions to the corresponding homogeneous equation for t>0. ty"-(t+1)y'+y=18t^3 ,y_1=e^t ,y_2=(t+1)

it said the answer to this was C_1e^t + C_2(t+1) - 18t^2(3/2+1/2t)

I don't understand how to get this answer at all

Math   Advanced-Math   
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