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Math Help - Prepping for the GRE... It's been a while. Need a refresher on f(x)

  1. #1
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    Prepping for the GRE... It's been a while. Need a refresher on f(x)

    Hey everyone!

    I'm here because I'm getting ready to write the GRE, and I'm stumped, since it's been 9 years since I did any math. (Though I was good at it back in the day!)

    "The function f is defined for all numbers x by f(x) = x2 + x. If t is a number such that f (2t) = 30, which two of the following could be the number t?
    Indicate two such numbers.
    (Multiple choice: -5, -3, -1/2, 2, 5/2)"

    Thanks in advance!
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  2. #2
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    Re: Prepping for the GRE... It's been a while. Need a refresher on f(x)

    Quote Originally Posted by jodester516 View Post
    Hey everyone!

    I'm here because I'm getting ready to write the GRE, and I'm stumped, since it's been 9 years since I did any math. (Though I was good at it back in the day!)

    "The function f is defined for all numbers x by f(x) = x2 + x. If t is a number such that f (2t) = 30, which two of the following could be the number t?
    You are given a formula for f(x) and asked about f(2t). Replace each "x" in the formula by "2t" and do the algebra.

    Indicate two such numbers.
    (Multiple choice: -5, -3, -1/2, 2, 5/2)"

    Thanks in advance!
    Thanks from jodester516
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  3. #3
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    Re: Prepping for the GRE... It's been a while. Need a refresher on f(x)

    Got it! Thanks!
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