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I have posted a link there to this thread so the OP can view my work.Differential Calculus Problem?

Consider the differential equation given by y''-2y'-15y=0

part 1) Set y=e^mx, determine the values of m which make y satisfy the above equation

part 2) Let m1 and m2 be the two values found in part (a). Show that for any constants c1 and c2 the function y=c1e^m1x+c2e^m2x also satisfies the above equation.