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anonymous

  • one year ago

Which of the following is not equivalent to the rational expression when x not equal to 7 ? x^2-49/x-7 A. x-7 B. x+7/x-7 C. 1/x+7 D. x+7

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  1. misty1212
    • one year ago
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    HI!!

  2. misty1212
    • one year ago
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    a rather strangely worded question, which you can interpret as "factor and cancel" does that help?

  3. anonymous
    • one year ago
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    not really because I suck at math honestly and hi haha

  4. misty1212
    • one year ago
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    lol ok lets do it then factor the top, which is \(x^2-49\) the "difference of two squares" \[a^2-b^2=(a+b)(a-b)\] always, so \[x^2-49=(x+7)(x-7)\]

  5. anonymous
    • one year ago
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    which of the following is equal to the rational expression when x not equal to 7............ I TYPED THE QUESTION WRONG!!!

  6. misty1212
    • one year ago
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    i knew that since 3 of them are NOT and only one of them IS

  7. anonymous
    • one year ago
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    yes... sorry

  8. misty1212
    • one year ago
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    since the numerator is \((x+7)(x-7)\) the entire fraction is \[\frac{(x+7)(x-7)}{x-7}\] now cancel

  9. anonymous
    • one year ago
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    x+7?

  10. misty1212
    • one year ago
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    you know what i mean by that?

  11. misty1212
    • one year ago
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    yeah you get \(x+7\)

  12. anonymous
    • one year ago
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    thank you

  13. misty1212
    • one year ago
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    \[\color\magenta\heartsuit\]

  14. anonymous
    • one year ago
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    :)

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