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anonymous

  • one year ago

Given that (6,-8) is on the graph of f(x), find the corresponding point for the function f(-1/2x).

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  1. jtvatsim
    • one year ago
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    Hmm... same type again huh? Well, we should have a better chance this time since we got the first one. :)

  2. jtvatsim
    • one year ago
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    Let's see, all we know is that f(6) = -8. That is "When x = 6, then y = -8". This means I can only get an answer if the x-value on the inside is equal to 6.

  3. anonymous
    • one year ago
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    Are you going to come back @jtvatsim

  4. jtvatsim
    • one year ago
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    So, I will force the inside of f(-1/2x) to be equal to 6. How can I do this? Easy, I wish for -1/2x = 6, so I can have my wish if x = -12. You can check that this actually works. So, we just have f(-1/2 * -12) = f(6) = -8. The corresponding point is x = -12, then y = -8. (-12,-8)

  5. anonymous
    • one year ago
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    @jtvatsim Thank you so much. I understand what to do now, and I just answered and got one correct on my own. Cheers

  6. jtvatsim
    • one year ago
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    Any questions? It's a little weird. My gut instinct when first doing this problem was just to plug in the original x-value like x = 6. But, I realized that this was a dead end, cuz we get f(-1/2 * 6) = f(-3) and I have no idea what f(-3) is supposed to equal... So, if we are more clever, we'll realize that we need to choose our x-value so that we END UP WITH the inside equal to 6. This is why I pick x = -12. Because then, f(-1/2 * -12) = f(6) and I know exactly what that equals, f(6) = -8.

  7. jtvatsim
    • one year ago
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    Awesome! Congrats! They aren't easy, so be proud of that! :)

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