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anonymous

  • one year ago

Which of the following is the graph the function f(x) = 3x^3 + 9^2 - 2x + 3 ?

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  1. anonymous
    • one year ago
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    I think the answer is either A or C, someone please help

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  2. e.mccormick
    • one year ago
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    Well, if x=0, then all the terms but the last go by by. So 0,3 must be on the graph.

  3. e.mccormick
    • one year ago
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    THat alone eliminates everything other than A and D. So all you need to do is pick one other easy test point and you can confirm.

  4. e.mccormick
    • one year ago
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    I would try x=1, cause then you do not really need to figure out much, and presto, second y value to check. With many of these types of questions, that is all you need to do. Find x=0 and x=1. It generally eliminates most of the graphs.

  5. anonymous
    • one year ago
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    how would you do x=1? would you just substitute 1 in for all the x's and then solve it?

  6. e.mccormick
    • one year ago
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    Yep. So you just end up with the numbers.

  7. e.mccormick
    • one year ago
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    When x=0, every factor with an x dissapears. That is why x=0 is easy. For x=1, the x does not matter and you just add and subtract the constants.

  8. e.mccormick
    • one year ago
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    And I am assuming you typoed the 9^2 and it is supposed to be 9x^2.

  9. anonymous
    • one year ago
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    it just shows as 9^2 not 9x^2

  10. e.mccormick
    • one year ago
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    Hmmm... that is probably a mistake, because NONE of the graphs are for it with 9^2 = 81. But one of them is for it with 9x^2.

  11. anonymous
    • one year ago
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    yeah, i think it was a mistake. i just checked again and got A as my final answer, is this correct?

  12. e.mccormick
    • one year ago
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    Yes. Cause when x=1 it would be 13. If yo look at (0,3) and (1,13) thy would only show up on graph A.

  13. anonymous
    • one year ago
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    thank you so much! :)

  14. e.mccormick
    • one year ago
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    np. Have fun, and no you know an easy way to do those. =)

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