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monroe17 Group Title

g(x)=sqrt(x(x-15)) find the domainnnnnnn.... :/

  • 2 years ago
  • 2 years ago

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  1. jim_thompson5910 Group Title
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    I'm guessing what I said last didn't help much?

    • 2 years ago
  2. monroe17 Group Title
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    It usually helps for that one problem, then I try to do it myself and I get completely lost :/ Functions are my weakness...

    • 2 years ago
  3. jim_thompson5910 Group Title
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    If so, then we can graph x(x-15) to get this (see attached)

    • 2 years ago
  4. jim_thompson5910 Group Title
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    Notice how the red graph is above the x axis from -infinity to 0 then it dips below the x axis but it comes back up and goes above the x axis from 15 to infinity

    • 2 years ago
  5. jim_thompson5910 Group Title
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    so this means that the solution to x(x-15) >= 0 is (-inf, 0] U [15, inf)

    • 2 years ago
  6. monroe17 Group Title
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    yeah (-inf,0]U[15,inf) ?

    • 2 years ago
  7. jim_thompson5910 Group Title
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    where 'inf' stands for infinity

    • 2 years ago
  8. jim_thompson5910 Group Title
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    yes you nailed it

    • 2 years ago
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