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anonymous

  • one year ago

For what value of x is the rational expression below undefined? 2x+4/x-7 A. 2 B. -2 C. -7 D. 7

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  1. kc_kennylau
    • one year ago
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    \[\Large f(x)=\frac{2x+4}{x-7}\]

  2. kc_kennylau
    • one year ago
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    So, we can't divide by zero, right?

  3. anonymous
    • one year ago
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    i believe so

  4. anonymous
    • one year ago
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    its undefined so that s what got to me

  5. kc_kennylau
    • one year ago
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    What value of \(\Large x\) would cause this problem?

  6. anonymous
    • one year ago
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    so would i just plus it all in?

  7. kc_kennylau
    • one year ago
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    Well that's one way of solving the puzzle, you can do that

  8. UsukiDoll
    • one year ago
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    what values of x makes the fraction undefined?

  9. anonymous
    • one year ago
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    but how would i know which one is undefined?

  10. UsukiDoll
    • one year ago
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    waitttt! look at the denominator first

  11. anonymous
    • one year ago
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    and hi miku hahaha

  12. UsukiDoll
    • one year ago
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    focus on that denominator just that denominator

  13. UsukiDoll
    • one year ago
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    we have x -7 right ?

  14. anonymous
    • one year ago
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    7?

  15. anonymous
    • one year ago
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    -7 yea

  16. anonymous
    • one year ago
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    wouldn't it have to be positive to be a undefined?

  17. UsukiDoll
    • one year ago
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    whoa... x - 7 what value of x makes it 0? it's like x-7 = 0 solve for x

  18. UsukiDoll
    • one year ago
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    yeah it has to be positive to be undefined

  19. UsukiDoll
    • one year ago
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    if you have a fraction like 1/0 that's undefined...we can't divide by 0

  20. anonymous
    • one year ago
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    ok thanks :)

  21. anonymous
    • one year ago
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    i got it well i understand it haha

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