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kelsey1

  • 3 years ago

f(x)=-x^2+5x+7 Find f(3a-4)

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  1. tacamry
    • 3 years ago
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    so wat am pose to be doing?

  2. Stephchen
    • 3 years ago
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    substitute 3a-4 to all the x in the equation

  3. kelsey1
    • 3 years ago
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    yes I know, but I'm not sure how to do that like can you show me the steps

  4. Hero
    • 3 years ago
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    f(x)=-x^2+5x+7 f(3a-4) = -(3a-4)^2 + 5(3a -4) + 7 Simplify the expression

  5. Stephchen
    • 3 years ago
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    |dw:1354855276611:dw| For the first term

  6. Hero
    • 3 years ago
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    Bro, the first term is negative

  7. Stephchen
    • 3 years ago
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    However there is a negative sign in fron of x so you have to multiply the first term with negative one.

  8. Stephchen
    • 3 years ago
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    Hero buddy, patience... lol

  9. Hero
    • 3 years ago
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    But anyway, the difficult part is done. Let the person finish it themselves.

  10. Stephchen
    • 3 years ago
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    I assume you'll have the idea to do the next ones from here on?

  11. kelsey1
    • 3 years ago
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    I know how to do foil and all the math yet are you solving for x or leaving it as a quadratic?

  12. Hero
    • 3 years ago
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    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?

  13. Stephchen
    • 3 years ago
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    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.

  14. Stephchen
    • 3 years ago
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    you're*

  15. kelsey1
    • 3 years ago
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    Well I meant "a" and my problem was that I thought I was solving for "a".

  16. Stephchen
    • 3 years ago
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    then I guess you're all set :)

  17. Hero
    • 3 years ago
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    @kelsey1, will you please just simplify the expression and let us know what you get?

  18. kelsey1
    • 3 years ago
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    9a^2-9a+3

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