- #1
Justabeginner
- 309
- 1
Homework Statement
Which of the following is not the same as the derivative of y with respect to x, if y= f(x)?
(a) lim as [itex] Δx [/itex] -> 0 of [itex] \frac{Δy}{Δx} [/itex]
(b) lim as h--> 0 of [itex] \frac {f(x+h) -f(x)}{h} [/itex]
(c) lim as [itex] x_1 [/itex] -> x of [itex] \frac {f(x_1)-f(x)}{(x_1-x)} [/itex]
(d) lim as h-> 0 of [itex] \frac {f(x) - f(x-h)}{h} [/itex]
(e) lim as [itex] Δx-> 0 [/itex] of [itex] \frac {f(Δx)}{Δx} [/itex]
(f) lim as h-> 0 of [itex] \frac{f(x)- f(x+h)}{-h} [/itex]
Homework Equations
The Attempt at a Solution
I think C is the correct answer. I immediately ruled out a, b, and e by recognizing them as accurate forms. I thought F was wrong at first, but then I noticed that the original form was changed (negative sign), so that is why the h is negative in the denominator. As for D, I just thought it didn't seem right at all. To be honest, I thought D and C are both incorrect, but the question seems to be asking me for one incorrect answer. Thank you.