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What do I do with my e's?!! Maths Question
dmg24
Posts: 33,920 Forumite
Hi guys,
Nearly at the end of my course, but missing a load of notes still so asking for a little help.
I have the following question:
Find the gradient of the curve with equation y = 5e^3x + 2e^-x at the point where x = 0.
Now I'm ok just with x's and how to find the gradient once I have the equation, but what do I do to those nasty e's?!!
Thanks chaps! x
Nearly at the end of my course, but missing a load of notes still so asking for a little help.
I have the following question:
Find the gradient of the curve with equation y = 5e^3x + 2e^-x at the point where x = 0.
Now I'm ok just with x's and how to find the gradient once I have the equation, but what do I do to those nasty e's?!!
Thanks chaps! x
Gone ... or have I?
0
Comments
-
Just to add, I've got 13 as the answer, but that could be rubbish! xGone ... or have I?0
-
If I remember right the differential of e^x = e^x therefore
if you let u = 3x and v = -x
dy/dx = du/dx * 5e^u + dv/dx * 2e^v
= 15e^3x - 2e^-x
if x = 0 then yes the answer would be 13 - but it is 10 years since I last properly did anything along these lines.0 -
Star - thanks Blacksheep! xGone ... or have I?0
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