# Is this PDA correct?

1. May 6, 2012

### AbsoluteZer0

Hi,

I'm new to differential equations and I am wondering if I solved this one correctly or if it's entirely wrong. Is it a differential equation at all?

for

12x3 + 6x2 + 9x
$\int$$\frac{dy}{dx}$ = $\int$12x3 + 6x2 + 9x (the boundaries being 1 and 2)
$\int$dy = $\int$12x3 + 6x2 + 9x
y = $\int$12x3 + 6x2 + 9x
y = $\frac{12x4}{4}$ + $\frac{6x3}{3}$ + $\frac{9x2}{2}$]
y = [3(2)4 + 2(2)3 + 4.5(2)2] - [3(1)4 + 2(1)3 + 4.5(1)2]
y = [48 + 16 + 18] - [9.5]
y = [76] - [9.5]
y = 66.5

Thanks,

Last edited: May 6, 2012
2. May 7, 2012

### JJacquelin

Hi !

The computation is almost entirely correct : only a mistake just at end.
But the writing of the symbols is almost entirely wrong (See attachment)
You have to take care of the different meanings and symbols of : Function, indefinite integral of the function and definite integral of the function.

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