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monroe17

  • 3 years ago

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

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  1. jim_thompson5910
    • 3 years ago
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    I'm guessing what I said last didn't help much?

  2. monroe17
    • 3 years ago
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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...

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

  4. jim_thompson5910
    • 3 years ago
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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

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

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

  7. jim_thompson5910
    • 3 years ago
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    where 'inf' stands for infinity

  8. jim_thompson5910
    • 3 years ago
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    yes you nailed it

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