integration

[kt chua]

Please refer attachment for the question and the step.
Is this consider as a first order differential equation?

 

[Deleted member 4993]

Please refer attachment for the question and the step.
Is this consider as a first order differential equation? Yes

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[kt chua]

There is some mistake i would like to correct, the answer for P3 is both 2.2 when volume increasement is 3.
So for a integrated equation that give the same value for all the variable as original equation we call them a differential equation?

Also if take P3=(P1-dp) why cant a correct answer be obtained?