anonymous
  • anonymous
What is the value of f(5) for the function f(x) = 3x - 4?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
f(5)= 3(5)-4 f(5)= 15-4 f(5)= 11
anonymous
  • anonymous
Thank you! I suck at functions..
anonymous
  • anonymous
Would you mind doing another one with me?

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DebbieG
  • DebbieG
f(some number) just means to plug in that number wherever you see "x", and simplify. That will give you the function value, "evaluated at x". @kdekle showed you how to do this above. Why not try your next problem yourself, and then just post what you did, and someone can tell you if you're right? I bet you can do it! :)
anonymous
  • anonymous
It has two letters now though, and i dont know where to begin. What is the value of f[g(5)] for the functions f(x) = 2x + 1 and g(x) = 2x - 5?
anonymous
  • anonymous
Does x just equal five in both of them?
anonymous
  • anonymous
no you start from the inside and work out. so the inside says g(5). so Work out 2(5)-5. Now THAT answer is the x value in f.
anonymous
  • anonymous
OH! (:
DebbieG
  • DebbieG
That one looks a little bit different... but it isn't really. :) Just do it in two steps. 1. find g(5) (just like how you did f(5) above, except you'll use g(x) and plug in 5 for x) 2. Once you have g(5), which is just going to be some number, plug THAT number into f(x) for x and proceed as before! :)
anonymous
  • anonymous
2(5)-5 10-5 5 2(5)+1 10+1 11 ?
anonymous
  • anonymous
exactly!
anonymous
  • anonymous
Awesome(: Thanks!!! I wish i could give both of you medals):
DebbieG
  • DebbieG
Remember, when you see f(something) (or g(something) or t(something) or Q(something).... the point being, it does not matter what letter is used to "name" the function, that's just a name)..... what it means it to take the "rule" that is given to define f, and plug in the (something) for the variable. So in this case, where you have f[g(5)], the "something" that is to go into f, is g(5). So first you need to find g(5), which you do by using the rule for g(x), with x=5. :)
DebbieG
  • DebbieG
You're welcome, and no problem, @kdekle got you started and I just gave an "assist", lol. :)

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