r(n) means "r subscript n"
The function y=e^(rx) has two values, r(1) and r(2) that satisfy the equation
y=a*e^[r(1)x] + b*e^[r(2)x]
is also a solution to the equation 2y''+y'-y=0?© BrainMass Inc. brainmass.com March 21, 2019, 10:24 pm ad1c9bdddf
This solution exemplifies linear equations.