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anonymous

  • one year ago

which of the following is an x-intercept of the function, f(x)= x^3-5x^2-8x+48 A.4 B.-2 C.-4 D.2

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  1. welshfella
    • one year ago
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    at an x intercept f(x) = 0 so plug in the options into the expression for f(x) and see which one works out to be 0

  2. welshfella
    • one year ago
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    for example for x = 4 we get (4)^3 - 5(4)^2 - 8(4) + 48 = ?

  3. welshfella
    • one year ago
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    64 - 80 -32 + 48 = ?

  4. welshfella
    • one year ago
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    does that come to 0? if it does you have your answer

  5. anonymous
    • one year ago
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    I did all four and none of them equal zero unless I did it wrong

  6. anonymous
    • one year ago
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    92 44 -28 52

  7. anonymous
    • one year ago
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    those were my answers...

  8. welshfella
    • one year ago
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    64 - 80 - 32 + 48 = 64 + 48 - 80 - 32 = 112 - 112 = 0

  9. welshfella
    • one year ago
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    A is the correct option

  10. anonymous
    • one year ago
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    ok thank you. I couldn't get it

  11. welshfella
    • one year ago
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    yw

  12. welshfella
    • one year ago
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    with something like this it might be easier to do all additions first then subtractions last

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