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ginwages
Oct 5, 2007, 04:55 PM
the function of x f(x)=4x-7
a) f(3)
b) f(-5)

the teacher told my son a) was the right answer. Why? If I can understand how to solve, I can help him.

thanks,

ginger wages

galactus
Oct 5, 2007, 05:03 PM
It's easier than you think. Just plug in the values.

f(3)=4(3)-7=12

That's all you do. Plug them in and see what you get.

ginwages
Oct 5, 2007, 05:07 PM
the function of x f(x)=4x-7
a) f(3)
b) f(-5)

the teacher told my son a) was the right answer. why? if i can understand how to solve, i can help him.

thanks,

ginger wages
thanks. Then why not -5? Because in my brain
f(-5)=4(-5)-7=-27

I don't understand why this is a wrong answer and 3 is a right answer
HELLLPPP!!

galactus
Oct 5, 2007, 05:24 PM
-20-7=-27. That's correct. How would anyone get 3 from that?

If it were f(5/2), then 3 would be the answer.

cool_dude
Oct 7, 2007, 08:31 AM
the function of x f(x)=4x-7
a) f(3)
b) f(-5)

the teacher told my son a) was the right answer.

LOL I see where your confusion is. You said a) was the right answer. But what you don't understand is that a) is the question!!

the question asks that you have an equation f(x) = 4x - 7 and it wants you to find the value when x = 3 which is part a) and when x = - 5 which is -27.

so the answers are as follows
a) f(3) = 4x-7 = 4(3) - 7 = 5
b) f(-5) = 4x - 7 = 4(-5) - 7 = -27


P.S. Galactus the answer to f(3) = 5 NOT 12

galactus
Oct 7, 2007, 09:28 AM
Yes, I see. A typo/brain fart.

FlowerRing123
May 11, 2009, 06:16 PM
LOL i see where your confusion is. you said a) was the right answer. but what you don't understand is that a) is the question!!!

the question asks that you have an equation f(x) = 4x - 7 and it wants you to find the value when x = 3 which is part a) and when x = - 5 which is -27.

so the answers are as follows
a) f(3) = 4x-7 = 4(3) - 7 = 5
b) f(-5) = 4x - 7 = 4(-5) - 7 = -27


P.S. Galactus the answer to f(3) = 5 NOT 12


Wow, your smart! U helped me a lot! :eek:
I'm a student! I needed help on my homework, then I came across this! THANKS A lot! :D

bdown1
Feb 20, 2010, 07:43 AM
Find the indicated value for the following function: f(x) = 3x + 6
Find where F(x) = 0

morgaine300
Feb 21, 2010, 01:46 AM
It would help terrifically a lot if you post your question in a new thread. I just spent time reading through all the above stuff just to find a completely different question. The more time we waste doing that, the longer it takes us to help people.

If f(x) = 0, then 0 = 3x + 6. Then solve.

wiccandream
Jun 23, 2010, 12:46 PM
I have been going absolutely insane trying to figure out functions and graphing and YOU have taught me how to do functions and I just want to say THANK YOU! My own instructor could not do this. Do you tutor? ($)

deonnief
Oct 27, 2010, 10:37 AM
Find the indicated value?
Find f(10) when f(x)=7x-3

Unknown008
Oct 27, 2010, 10:56 AM
Did you take a look at the previous answers? :rolleyes:

There is the method of how to solve your problem in there.

kanan_blg
Nov 10, 2010, 06:17 PM
f(10) = 7*10 - 3 = 70 - 3 = 67