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Math Help - function notation

  1. #1
    Senior Member euclid2's Avatar
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    function notation

    1. Determine the following where f(x) = 2x2 - x + 3
      a. f(-4)
      b. f(0)
      c. f(7)
      d. f(2y)
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by euclid2 View Post
    1. Determine the following where f(x) = 2x2 - x + 3
      a. f(-4)
      b. f(0)
      c. f(7)
      d. f(2y)
    Just substitute each value of x into f(x)

    a) f(-4)=2(-4)^2-(-4)+3 and simplify.

    Do same for the others.
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  3. #3
    Senior Member euclid2's Avatar
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    so its f(-4)=39, right?
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  4. #4
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    Yes.
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  5. #5
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    notation

    Is f(x)=(2x)2-x+3 or
    (2)(2)-x+3?
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  6. #6
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    From what he wrote, it seems to be f(x) = 2x^2 -x+3
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  7. #7
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    text

    Ah. I see. So would the solution to f(2y) be quadratic? P.S. How do you guys type in that font(where 2x^2 actually looks like 2x^2)?
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  8. #8
    A riddle wrapped in an enigma
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    Quote Originally Posted by EyesForEars View Post
    Ah. I see. So would the solution to f(2y) be quadratic?
    f(x)=2x^2-x+3

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

    f(2y)=8y^2-2y+3

    Quote Originally Posted by EyesForEars View Post
    P.S. How do you guys type in that font(where 2x^2 actually looks like 2x^2)?
    It's called Latex (pronounced Lay-tek), and you can go here and look at the first post for a tutorial.

    You can also click on the equation or whatever in the post and you can see the code used to form it.
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