Calc Help: Solving Differential Equation y'' + y' - 6y=0 with e^(rt)

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The discussion focuses on solving the differential equation y'' + y' - 6y = 0 using the function y = e^(rt). Participants emphasize the need to find the first and second derivatives of y(t) and substitute these into the equation to determine the values of r that satisfy the equation. The derivatives are calculated as y' = re^(rt) and y'' = r^2e^(rt). The characteristic equation derived from substituting these derivatives is r^2 + r - 6 = 0, which factors to (r - 2)(r + 3) = 0, yielding r = 2 and r = -3 as the solutions.

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Calc Help!

For what values of r does the function y= e^(rt) satisfy the differential equation y'' + y' - 6y=0
 
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Find the first derivative of of y(t) and its second derivative then use those values in the differential equation. The rest should be obvious!
 
Remember that e^(rt) can never equal 0.
 

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