- Solve the differential equation d2y/dx2-4y=4e^-2x?

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Please help me with this math!!? Help! what are the values that will make this undefined: (x+4)/(x2+2x-15). Answers: A. x= 3 or -5 B. -3 or 5 C. 3 or 5 D. -3 or -5? Find the derivative y^5+x^3=y^2+9x? What is the average time to walk 0.7 miles? If f(x) is differentiable for all of x find the value of a and b : f(x)=cos (x) if x<0 =ax+b If x>or equal to zero?