anonymous
  • anonymous
f(x)=-x^2+5x+7 Find f(3a-4)
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
so wat am pose to be doing?
anonymous
  • anonymous
substitute 3a-4 to all the x in the equation
anonymous
  • anonymous
yes I know, but I'm not sure how to do that like can you show me the steps

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Hero
  • Hero
f(x)=-x^2+5x+7 f(3a-4) = -(3a-4)^2 + 5(3a -4) + 7 Simplify the expression
anonymous
  • anonymous
|dw:1354855276611:dw| For the first term
Hero
  • Hero
Bro, the first term is negative
anonymous
  • anonymous
However there is a negative sign in fron of x so you have to multiply the first term with negative one.
anonymous
  • anonymous
Hero buddy, patience... lol
Hero
  • Hero
But anyway, the difficult part is done. Let the person finish it themselves.
anonymous
  • anonymous
I assume you'll have the idea to do the next ones from here on?
anonymous
  • anonymous
I know how to do foil and all the math yet are you solving for x or leaving it as a quadratic?
Hero
  • Hero
Nothing nowhere says to solve for x. In fact, when I posted the hint I gave you. I left a comment below saying to "simplify the expression". How did you interpret "solve for x" from that?
anonymous
  • anonymous
x becomes a, so x is out of the picture. if your asked to simplify the expression then I guess all you have to do is the equation hero did setup for you.
anonymous
  • anonymous
you're*
anonymous
  • anonymous
Well I meant "a" and my problem was that I thought I was solving for "a".
anonymous
  • anonymous
then I guess you're all set :)
Hero
  • Hero
@kelsey1, will you please just simplify the expression and let us know what you get?
anonymous
  • anonymous
9a^2-9a+3

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