Solution to PDA: Solving 12x3 + 6x2 + 9x

[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,

 

[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.