Question

I need help solving functions.

Answer 1

@TheSmartOne

Answer 2

I dont have a specific example, just functions in general.

Answer 3

When you say functions, what do you mean exactly?

Do you mean like solving 2 equations such as:
x+y=2
x-y=1

(Chose random numbers, may not get whole number values for x and y :P)

Or something like

x^2+53x-42

(Same thing as above equation, random numbers :P)

Answer 4

I meant function as in..

Answer 5

f(x)=......

Answer 6

Either when you have f(x) alone or with g(x)

Answer 7

Sometime to note is that

y=f(x)

You can use f(x) and y interchangebly.

Answer 8

Oh, right. Sorry. I forgot.

Answer 9

@inowalst
Functions are something that you plug in a number, and you get something back.

You can not solve a function... you can either graph a function or plug in a value and get a result out of.

Answer 10

Okay. Yes, I meant plugging in a value...

Answer 11

Ah, okay then :)

Answer 12

Let me see if I can find an example, if you dont mind?

Answer 13

So for example if they gave us

\(\sf f(x)= x^5+34x^2+x-21\)

And they want to know the value of \(\sf f(3)\)

So this is how we would be able to solve it:

Notice that \(\sf f(x)\) became \(\sf f(3)\)
That means \(\sf x=3\)
So we just plug in 3 into that equation.

\(\sf f(x)= x^5+34x^2+x-21\)
\(\sf f(3)= x^5+34x^2+x-21\)
\(\sf f(3)= (3)^5+34(3)^2+(3)-21\)
\(\sf f(3)= 243+34(3)^2+(3)-21\)
\(\sf f(3)= 243+34(9)+(3)-21\)
\(\sf f(3)= 243+34(9)+3-21\)
\(\sf f(3)= 243+306+3-21\)
\(\sf f(3)=531 \)

Answer 14

Took a while to type that all out, and it got so long I didn't even notice your comment about finding an example, haha.

Answer 15

lol No, its fine. That's exactly what I meant, though.

Answer 16

Well, I hope that helps :)

Answer 17

It does. Thank you!!

Answer 18

:)

Answer 19

dot.