Question

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

Answer 1

I'm guessing what I said last didn't help much?

Answer 2

It usually helps for that one problem, then I try to do it myself and I get completely lost :/ Functions are my weakness...

Answer 3

If so, then we can graph x(x-15) to get this (see attached)

Answer 4

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

Answer 5

so this means that the solution to

x(x-15) >= 0

is

(-inf, 0] U [15, inf)

Answer 6

yeah (-inf,0]U[15,inf) ?

Answer 7

where 'inf' stands for infinity

Answer 8

yes you nailed it