Using rate of change of a function to find an expression's value - Page 2

Integraluser · June 30th, 2018, 05:48 AM

Yeah, this is a literal translation:

If that rate of change of function f when x changes from x to x+h equals $\displaystyle 6x^2h - 3xh^2$, whereas h is a real number approaching 0, find f'(-2)

it has no answer choices, it needs the solution written with steps and so.

skipjack · June 30th, 2018, 07:54 AM

Was the textbook written by a committee rather than a professional mathematician?

Integraluser · June 30th, 2018, 12:21 PM

Yeah a committee I assume, 4 doctors administrated its authorship and 6 have written it, 3 among of whom are doctors according to the book. It's even the official book by the ministry of education being taught in schools, not sure why this mistake is there twice.

Doesn't matter actually, it's fine since I've got your opinions regarding it and we agreed on the same point (that it should be "change in y" rather than "rate of change"). I might of tell someone who can do something about it so that it gets fixed.

skipjack · July 1st, 2018, 01:37 AM

Even if "rate of" is omitted, the questions are flawed.

Integraluser · July 1st, 2018, 07:30 AM

Why so?

skipjack · July 1st, 2018, 10:56 AM

Try to find a function with the specified property.

Integraluser · July 2nd, 2018, 10:42 AM

Oh alright, maybe the nearest function would be $\displaystyle x^3$ but you are right. I think they made it like this just to make it suit their wanted idea.

June 30th, 2018, 05:48 AM	#11
Integraluser Newbie Joined: Jun 2018 From: Jordan Posts: 24 Thanks: 0	Yeah, this is a literal translation: If that rate of change of function f when x changes from x to x+h equals $\displaystyle 6x^2h - 3xh^2$, whereas h is a real number approaching 0, find f'(-2) it has no answer choices, it needs the solution written with steps and so.
$Integraluser is offline$

June 30th, 2018, 07:54 AM	#12
skipjack Global Moderator Joined: Dec 2006 Posts: 21,105 Thanks: 2324	Was the textbook written by a committee rather than a professional mathematician?
$skipjack is offline$

June 30th, 2018, 12:21 PM	#13
Integraluser Newbie Joined: Jun 2018 From: Jordan Posts: 24 Thanks: 0	Yeah a committee I assume, 4 doctors administrated its authorship and 6 have written it, 3 among of whom are doctors according to the book. It's even the official book by the ministry of education being taught in schools, not sure why this mistake is there twice. Doesn't matter actually, it's fine since I've got your opinions regarding it and we agreed on the same point (that it should be "change in y" rather than "rate of change"). I might of tell someone who can do something about it so that it gets fixed. Last edited by Integraluser; June 30th, 2018 at 12:25 PM.
$Integraluser is offline$

July 1st, 2018, 01:37 AM	#14
skipjack Global Moderator Joined: Dec 2006 Posts: 21,105 Thanks: 2324	Even if "rate of" is omitted, the questions are flawed.
$skipjack is offline$

July 1st, 2018, 07:30 AM	#15
Integraluser Newbie Joined: Jun 2018 From: Jordan Posts: 24 Thanks: 0	Why so?
$Integraluser is offline$

July 1st, 2018, 10:56 AM	#16
skipjack Global Moderator Joined: Dec 2006 Posts: 21,105 Thanks: 2324	Try to find a function with the specified property.
$skipjack is offline$

July 2nd, 2018, 10:42 AM	#17
Integraluser Newbie Joined: Jun 2018 From: Jordan Posts: 24 Thanks: 0	Oh alright, maybe the nearest function would be $\displaystyle x^3$ but you are right. I think they made it like this just to make it suit their wanted idea.
$Integraluser is offline$

Thread Tools
$Show Printable Version$ Show Printable Version $Email this Page$ Email this Page
Display Modes
$Linear Mode$ Linear Mode $Hybrid Mode$ Switch to Hybrid Mode $Threaded Mode$ Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
find instantaneous rate of change	rrosa522	Pre-Calculus	2	February 23rd, 2016 05:54 AM
Factoring a function's rate of change	Mifarni14	Algebra	2	November 14th, 2015 04:02 PM
Rate of change/linear function	Sparkleandpop	Pre-Calculus	2	September 25th, 2015 06:56 AM
How to find the average rate of change	Shayna	Calculus	1	June 4th, 2014 06:51 PM
Finding an expression for Instantaneous rate of change	alyssa jesse	Calculus	3	October 6th, 2013 02:21 AM

pumping lemma palindrome example