Hello, im trying to solve the following limit:

I've tried to multiply the entire expression by:

So I could take the square root out of the numerator, but i don't know what to do next, i tried to factor the numerator to x(x+3) and cancel with the (x+3) which appears in the denominator but i don't know what to do next.

I'm not allowed to use L'Hopital rule

I need some help...

Sorry for my english.