Question:
Llinear equations
r(n) means "r subscript n"
The function y=e^(rx) has two values, r(1) and r(2) that satisfy the equation
2y''+y'-y=0.
How can I show that every number of the family of functions
y=a*e^[r(1)x] + b*e^[r(2)x]
is also a solution to the equation 2y''+y'-y=0?