- Thread starter Missy
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anywhere you see a x plug in a -2Missy said:Can someone guide me in the right direction to figuring out this problem I don't know where to begin.

if f(x) = 3^2 +5x -2 find f(-2)

so you then have:

3^2+5(-2)-2

does that help

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Missy said:Can someone guide me in the right direction to figuring out this problem I don't know where to begin.

if f(x) = 3^2 +5x -2 find f(-2)<<< could it be 3x^2+ 5x - 2

would appreciate any help you can give me. Need to pass this math class to get my degree

Missy

just substitute -2 everywhere you see an xMissy said:yes that is what I meant sorry about the typo

yes the question was if f(x) = 3x^2 +5x - 2 find f(-2) thank you for correcting me I had really gotten confused myself

again thank you,

Missy

the solve

Okay so you started with f(x)= 3x^2 + 5x - 2Missy said:ok you said to put -2 anywhere that I see an x so does this mean that

3(-2) + 5 (-2) -2

so then this would be -6 +-10 -2

I am really confused here can you explain a little more

Missy

f(x) is a function of x

so

f(-2) means that you would replace all the x's with -2

which gives you

f(-2)= 3(-2)^2 + 5(-2) - 2

= 3(4) + (-10) -2 squared the -2

= 12-10-2

= 0

if it was f (-10) then you would have

f(-10) = 3(-10)^2 + 5(-10) - 2

= 3(100) + (-50) -2

= 300-50-2

= 248