take it from here?
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 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.
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'!!
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: