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anonymous

  • 5 years ago

I need to discover steps to solve this expression: (3x+12)/(x+4)

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  1. anonymous
    • 5 years ago
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    What do you mean solve? There is nothing to solve here. e.g. no = sign.

  2. anonymous
    • 5 years ago
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    He probably means to "SIMPLIFY".

  3. myininaya
    • 5 years ago
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    simplified or divide is better: 3(x+4)/(x+4)

  4. myininaya
    • 5 years ago
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    simplify* it is not only better to say it is accurate to say in this case

  5. anonymous
    • 5 years ago
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    You don't need to discover anything, someone already did. Just take 3 as a common factor of the numerator, and then (x+4) will be cancelled from the top and bottom as: \[{3x+12 \over x+4}={3(x+4) \over x+4}\]

  6. anonymous
    • 5 years ago
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    =3

  7. myininaya
    • 5 years ago
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    this expression =3 as long as x does not equal -4

  8. anonymous
    • 5 years ago
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    Not really. It's always 3, for any value of x (including -4).

  9. myininaya
    • 5 years ago
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    no what happens if you plug in -4 into the original expression

  10. anonymous
    • 5 years ago
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    It wouldn't affect the value. Try graphing the function. It's nothing but a horizontal line at y=3.

  11. myininaya
    • 5 years ago
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    its good to point stuff out like this early because when start talking about continuity in calculus they are going to find out f(-4) DNE but the limit has x approaches -4 exist which is 3 in this case i never had a calculator to graph holes

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