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anonymous

  • one year ago

I need to isolate x. How would I do this?

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  1. anonymous
    • one year ago
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    \[\frac{-9x-6}{2\sqrt{x+1}}\]

  2. amistre64
    • one year ago
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    is this an expression or an equation?

  3. anonymous
    • one year ago
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    It's supposed to say =0 after it

  4. amistre64
    • one year ago
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    oh, do you know what a fraction is equal to zero?

  5. amistre64
    • one year ago
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    **when a fraction is equal to zero

  6. anonymous
    • one year ago
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    Are you asking me if I know what happens or do you want to know the variable that would make the denominator 0?

  7. amistre64
    • one year ago
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    if we consider a fraction as telling us how many we have, out of how many there are total ... 0 out of anything would equate to having none of it. if we cut a pizza into 6 slices, and we get no slices ... we have 0 out of 6 slices. 0/6

  8. amistre64
    • one year ago
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    in order for a fraction to equal zero, it is required that the top must equal zero ...

  9. amistre64
    • one year ago
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    or, just mathing it. multiply both sides by the denominator ... the left side cancels out the bottom, and the right side is just a multiplication of 0

  10. amistre64
    • one year ago
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    \[\frac ab=0\] \[b*\frac ab=0*b\] \[a=0*b=0\]

  11. anonymous
    • one year ago
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    So I need to figure out what x value makes the numerator 0?

  12. amistre64
    • one year ago
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    correct

  13. anonymous
    • one year ago
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    x= -6/9

  14. amistre64
    • one year ago
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    then that should be the value of x that makes the left side equate to 0

  15. amistre64
    • one year ago
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    as long as it does not zero out the bottom ... or possibly make the sqrt a negative arguement ...

  16. anonymous
    • one year ago
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    Awesome. Thank you!

  17. amistre64
    • one year ago
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    youre welcome

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