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Subject: "functions"     Previous Topic | Next Topic
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Conferences The CTK Exchange High school Topic #310
Reading Topic #310
cyclone
guest
Feb-27-05, 07:50 PM (EST)
 
"functions"
 
   It's been too long, sorry but this a first post.

9th grade son needs to learn how to solve this function and I'm rusty. Don't need it'solved just a push in the right direction please.

f(x)=(-3-10x)/(10x^2 -7-15x), find f(-6)

I'm thinking that I plug the -6 in for x then solve. Am I correct?

Thanks

an old man....


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alexbadmin
Charter Member
1457 posts
Feb-27-05, 07:54 PM (EST)
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1. "RE: functions"
In response to message #0
 
   >9th grade son needs to learn how to solve this function and
>I'm rusty.

There must be something wrong with your terminology. Functions are not solved, equations are. Functions may be evaluated, simplified, multiplied, but not solved.

>Don't need it'solved just a push in the right
>direction please.
>
>f(x)=(-3-10x)/(10x^2 -7-15x), find f(-6)

If that is the question: find f(-6), there is nothing to solved, but just compute f(-6), i.e. evaluate f(x), as defined above, for x = -6.

>I'm thinking that I plug the -6 in for x

Just plug and calculate.

> then solve.

Nothing to solve here.

> Am I correct?

You are correct to mind your son's maths.


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Cino Hilliard
guest
Mar-01-05, 11:42 AM (EST)
 
2. "RE: functions"
In response to message #1
 
   >>9th grade son needs to learn how to solve this function and
>>I'm rusty.
>
>There must be something wrong with your terminology.
>Functions are not solved, equations are. Functions may be
>evaluated, simplified, multiplied, but not solved.
>
>>Don't need it'solved just a push in the right
>>direction please.
>>
>>f(x)=(-3-10x)/(10x^2 -7-15x), find f(-6)
>
>If that is the question: find f(-6), there is nothing to
>solved, but just compute f(-6), i.e. evaluate f(x), as
>defined above, for x = -6.
>
>>I'm thinking that I plug the -6 in for x
>
>Just plug and calculate.
>
>> then solve.
>
>Nothing to solve here.
>
>> Am I correct?
>
>You are correct to mind your son's maths.

From Encarta dictionary

solve < solv > (past solved, past participle solved, present participle solv·ing, 3rd person present singular solves)


transitive verb

1. deal with a problem successfully: to find a way of dealing successfully with a problem or difficulty


2. find answer to a puzzle: to find the answer to a question or puzzle


3. mathematics find answer to math problem: to work out the solution to an equation or other mathematical problem


<15th century. From Latin solvere “to loosen, dissolve.”>

Based on this I think the use of solve in the org poster's
question is correct.

Eg., solve f(x) = a is a valid statement. f(x) is a function so
solve this function f(x)= a implies to solve the finction f(x)= a.

I think you may have been a little hard on a first time poster. But,
hey, rank has its privleges.:-)

Cino


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alexbadmin
Charter Member
1457 posts
Mar-01-05, 11:44 AM (EST)
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3. "RE: functions"
In response to message #2
 
   >Eg., solve f(x) = a is a valid statement. f(x) is a function
>so solve this function f(x)= a implies to solve the finction
>f(x)= a.

Right. Except there was not a question of solving f(x) = a. It was a question of evaluating f(x).

>I think you may have been a little hard on a first time
>poster. But, hey, rank has its privleges.:-)

Quite stupid.


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