Hi. I have this problem: Use the method of undetermined coefficients to find one solution of y'' + 2y' - 7y = [(-1t^2)+4t+7]e^(2t). Find a specific solution, not a general one. I'm having lots of trouble finding the coefficients. I'm assuming I need to use [(At^2)+Bt+C]*e^(2t). This however does not seem to work. Can anyone confirm this as the function I need to use for differentiation? Thank you.