Second Order Differential Equation problem

jayanthd
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I have a small problem in solving a Second Order Linear Constant Coefficient Differential Equation.
Please see the attached image. I understand upto the point above the arrow. What I don't understand is how he got

dy/dx = 9

attachment.php?attachmentid=60025&d=1372759573.png
 

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Have a look at the problem statement again.
 
CAF123 said:
Have a look at the problem statement again.

Thank you very much. I had not seen that the slope dy/dx of the equation was given as 9.
 
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