Need help (Integration mathematics)

Tiques

Fledgling Freddie
Joined
Jan 27, 2005
Messages
121
Not sure if it is translated to "Integration" but when you integrate a variable called:

x^2

you get:

1/3 * x^3

Okay, if you know what Im speaking about, you might be able to help me with this one:

The integration is of

dy/dx = a * e^0,68024x

The information tells us that given that

Y = -191,11 * e^0,68024x - 191,11

I have to find the constant "a"

Anyone know how to do this?

Thanks in advance :)
 

Mey

Part of the furniture
Joined
Apr 9, 2005
Messages
4,252
Now I know it was the right choice to do Psychology / sociology / Media Studies / Philosophy of Religion at college. :D
 

elisera

Fledgling Freddie
Joined
Sep 3, 2004
Messages
432
Tiques said:
Not sure if it is translated to "Integration" but when you integrate a variable called:

x^2

you get:

1/3 * x^3

Okay, if you know what Im speaking about, you might be able to help me with this one:

The integration is of

dy/dx = a * e^0,68024x

The information tells us that given that

Y = -191,11 * e^0,68024x - 191,11

I have to find the constant "a"

Anyone know how to do this?

Thanks in advance :)
Ok basically if you integrate e^bx you get (1/b)(e^bx)+constant of integration, integrating your first equation you get

y = a/0.68024 *e^0.68024x + C

since it tells you what y is equal to you just need to equate the coefficients :) ie

a/0.68024 = -191.11
C = -191.11

and hey presto you can find a :)
 

Tiques

Fledgling Freddie
Joined
Jan 27, 2005
Messages
121
elisera said:
Ok basically if you integrate e^bx you get (1/b)(e^bx)+constant of integration, integrating your first equation you get

y = a/0.68024 *e^0.68024x + C

since it tells you what y is equal to you just need to equate the coefficients :) ie

a/0.68024 = -191.11
C = -191.11

and hey presto you can find a :)
So logical when you said it now :D

shame I had to turn it in this morning :(
 

elisera

Fledgling Freddie
Joined
Sep 3, 2004
Messages
432
Guess I should check this forum more often then :)

if you get stuck on anything else like this feel free to chuck a pm my way and if i can help you i will (just finishing my degree in maths) :)
 

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