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Helpjebal

  • one year ago

h(x) = - 3x2 + 2x + 12 answer: all real numbers How did they get this answer and what does it mean to be all real numbers?

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  1. SolomonZelman
    • one year ago
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    Do you mean the domain?

  2. BloomLocke367
    • one year ago
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    What were they looking for?

  3. helpjebal
    • one year ago
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    yes it is a lesson on domain of a function

  4. SolomonZelman
    • one year ago
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    The domain is all real numbers, simply speaking, because you can plug any real number for x into the equation h(x), and get a valid output.

  5. SolomonZelman
    • one year ago
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    Any polynomial, by defnition, will have a domain of "all real numbers".

  6. helpjebal
    • one year ago
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    so just because it's a polynomial, we know right off the bat that the domain will be "all real numbers" which is 0 and any positive whole number?

  7. SolomonZelman
    • one year ago
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    Think about it logically. You have whole number powers of x, with some coefficients in front of them, (+ some number at the end sometimes). No matter what real number you put in for x, you get a real number back. there is just simply no reason for the output to be imaginary if you plug in a real number.

  8. SolomonZelman
    • one year ago
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    You can make an exercise, perhaps.... Make up a polynomial, and plug in some real numbers into the polynomial. You will always see that your output is going to be a real number.

  9. helpjebal
    • one year ago
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    thank you! just tried that exercise and it totally worked. Thanks again!

  10. SolomonZelman
    • one year ago
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    You are welcome!

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