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anonymous

  • one year ago

What is the domain of (f*g) (x)=45x^2+19x-42? Can someone please help me? I can not, for the life of me, get this. I need it explained to me in a way I won't forget.

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  1. Haseeb96
    • one year ago
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    What do u think, what would be the domain for this ?

  2. anonymous
    • one year ago
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    I think it's completely wrong...but I think it is...(.77, infinity) , and (1.2, infinity)

  3. welshfella
    • one year ago
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    I assume you know what a domain is?

  4. anonymous
    • one year ago
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    But like I said...I'm pretty sure it is completely wrong...

  5. anonymous
    • one year ago
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    Yes...domain is the X value and it goes from left to right

  6. welshfella
    • one year ago
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    right This function is a parabola which opens upwards and looks a bit like |dw:1442166537213:dw|

  7. welshfella
    • one year ago
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    excuse the rough drawing but it should give you an idea what the domain is.

  8. anonymous
    • one year ago
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    It's OK. I understand what you were trying to show me. And I know that part. :)

  9. anonymous
    • one year ago
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    I need to put the domain in a form like this: |dw:1442166761514:dw| but I don't know how to...

  10. welshfella
    • one year ago
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    well the domain is all real numbers and you can write it as (-infinity, + infinity)

  11. anonymous
    • one year ago
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    Really? I don't need to include any numbers? Wow...I was wrong

  12. welshfella
    • one year ago
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    no its all reals think about it you can any number you like into the function and it will give you a value

  13. welshfella
    • one year ago
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    -10,000,000 , 0 or 555,000,000,000

  14. anonymous
    • one year ago
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    Oh...ok. That makes since.

  15. welshfella
    • one year ago
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    yw

  16. anonymous
    • one year ago
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    :)

  17. amistre64
    • one year ago
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    the domain depends on the domains of f and g seperately, not combined.

  18. anonymous
    • one year ago
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    well the original term is f(x)=4x+9 and g(x)=7x-3

  19. amistre64
    • one year ago
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    spose for instance f = (x-3)(x-2)(x-1) g = 1/(x-1) (f*g) = (x-3)(x-2) .. but the domain is still restricted by g

  20. amistre64
    • one year ago
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    then there is no issue concerning f*g

  21. skullpatrol
    • one year ago
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    Use FOIL

  22. anonymous
    • one year ago
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    45x^2+19x-42?

  23. skullpatrol
    • one year ago
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    yup :-)

  24. anonymous
    • one year ago
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    ok.

  25. amistre64
    • one year ago
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    f can use all real values as inputs g can use all real values as inputs so the domain of (f*g) in this case has no restrictions to it ...

  26. anonymous
    • one year ago
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    Ok...

  27. skullpatrol
    • one year ago
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    What exactly is the question asking for?

  28. anonymous
    • one year ago
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    Well I took so long to answer the other question that it gave me another question like it...

  29. skullpatrol
    • one year ago
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    Is this a program?

  30. anonymous
    • one year ago
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    Yes...it's mymathlab

  31. skullpatrol
    • one year ago
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    What grade?

  32. anonymous
    • one year ago
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    It's college- freshman

  33. skullpatrol
    • one year ago
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    Post the question please.

  34. welshfella
    • one year ago
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    oh sorry - i misread the question

  35. anonymous
    • one year ago
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  36. anonymous
    • one year ago
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    It's ok

  37. anonymous
    • one year ago
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    Thank you guys/girls!

  38. skullpatrol
    • one year ago
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    I can barely read that, which part do you need help with?

  39. anonymous
    • one year ago
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    I got it...thank you guys. Sorry to trouble you guys. :)

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