Flash Flash Revolution - View Single Post - Indices, Exponential and Logarithmic Equations + Trig + Derivatives

**sickufully** · 04-29-2016, 11:55 PM

So with the first one, when you do this step:

What exactly happens to the 6 out the front and the +3 before (-sin...)?
Are they just divided by each other, so the 6 = 2 and the 3 = 1 (which just disappears)?

And for the second one, I completely missed that rule for 1/x = x^-1. Also, the final simplifying step you did, is it necessary to do that or is it OK to leave it as: -3/x^2 + e^3x + 2/x^3?

I do understand how you got 2-3x/x^3 + e^3x, I'm just wondering if I'll lose marks in a test for not simplifying further.

04-29-2016, 11:55 PM	#19
sickufully Sir Krisk Join Date: Dec 2007 Location: Vic, Australia Posts: 930	Re: Indices, Exponential and Logarithmic Equations + Trig + Derivatives So with the first one, when you do this step: What exactly happens to the 6 out the front and the +3 before (-sin...)? Are they just divided by each other, so the 6 = 2 and the 3 = 1 (which just disappears)? And for the second one, I completely missed that rule for 1/x = x^-1. Also, the final simplifying step you did, is it necessary to do that or is it OK to leave it as: -3/x^2 + e^3x + 2/x^3? I do understand how you got 2-3x/x^3 + e^3x, I'm just wondering if I'll lose marks in a test for not simplifying further. __________________