Can be solved by reducing the numerator (top bracket) to see how it will react with the denominator (bottom bracket).
Looking at the 30, we see it can be factored into
The last factors look appealing because they will add up to
And we know both signs here must be positive because we had to
Placing our factors into the original equation:
Gives us good news, because one of the factors cancels out the denominator to leave: