take it from here?
Hi,
Differentiate using first principles:
y = 2x^-2 + 3x^-1
I keep getting bogged down at the point:
1/(2x^2 + 4xh + 2h^2) + 1/(3x + 3h)
as I have to subtract (2x^-2 + 3x^-1) from the above.
If anyone could help i would greatly appreciate it.
Thanks
thanks for the replies guys, I follow it to the step above, but I'm still struggling, specifically with how to factor out, the examples I've dealt with so far are nowhere near this level.
Greatly appreciated.
I don't know whether it's because it's 2 am or because I'm having a brain melt but I just can't make this work. You're right, I should know how to do this but I have just started a maths course after along time 'away from the game'!!
The material you are learning now and in the future will depend on your knowledge of the prior material. If you've had a significant gap in your learning, then you really should make the effort to give yourself a serious review of your earlier courses. You could read through your old textbooks if you have them, or look for tutorials on the web.
Notice that when , the denominator is no longer zero. Since we're taking the limit of a rational function whose denominator is not zero, you can calculate the value of the limit by substituting into the expression:
Then reduce,