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brodybarnes35

  • one year ago

Given the functions a(x) = 3x − 12 and b(x) = x − 9, solve a[b(x)] and select the correct answer below. a[b(x)] = 3x2 − 21 a[b(x)] = 3x2 − 39 a[b(x)] = 3x − 21 a[b(x)] = 3x − 39

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  1. brodybarnes35
    • one year ago
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    @Sammylemon @hero @Nnesha @Mehek14

  2. brodybarnes35
    • one year ago
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    please help ill medal and fan if i dont fan you already

  3. anonymous
    • one year ago
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    The easiest way to explain is with an example....say you're evaluating for x=2. Because it's asking for a(b(x)), you plug in the x value into b(x) first. Whatever answer you get, you plug that in for x in the a(x) function.

  4. brodybarnes35
    • one year ago
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    ok??? :/

  5. anonymous
    • one year ago
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    because they didn't give you a value for x, you have to plug in the entire b(x) function for every x value in the a(x) function. Once you've done that you simplify

  6. brodybarnes35
    • one year ago
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    ok what next??

  7. anonymous
    • one year ago
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    so it'll look like this... a(b(x))=3(x-9)-12

  8. brodybarnes35
    • one year ago
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    oh ok so next it would be 3x - 27 - 12

  9. brodybarnes35
    • one year ago
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    ???

  10. anonymous
    • one year ago
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    perfect, combine like terms and you're done.

  11. brodybarnes35
    • one year ago
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    x = -39?

  12. brodybarnes35
    • one year ago
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    wait now divide

  13. anonymous
    • one year ago
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    nope...you're not solving for anything. go back to what you had before...3x-27-12

  14. brodybarnes35
    • one year ago
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    3x = -39 x = -13

  15. anonymous
    • one year ago
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    again, not solving for anything....so when you combine like terms that's just a fancy way of saying do all addition and subtraction you can. If you have 2x+3x-12 and you combine terms it would be 5x-12.

  16. brodybarnes35
    • one year ago
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    oh ok

  17. anonymous
    • one year ago
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    so 3x-27-12...you can combine the -27 and the -12

  18. brodybarnes35
    • one year ago
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    again that would be -39

  19. anonymous
    • one year ago
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    yup...put it with the first part of the equation and you have a(b(x))=3x-39

  20. brodybarnes35
    • one year ago
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    oh ok what now

  21. anonymous
    • one year ago
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    that's it...in your original question it's the last choice in the list.

  22. anonymous
    • one year ago
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    it's not set equal to anything so x is just a variable...it could be anything.

  23. brodybarnes35
    • one year ago
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    OH ITS D

  24. brodybarnes35
    • one year ago
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    YAYAYA YOUR AMAZING THANKS can you help with a couple more???

  25. anonymous
    • one year ago
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    I'm a math/science teacher so I should know what I'm talking about :)

  26. anonymous
    • one year ago
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    and sure, I have a little more time.

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