Hi I know is is probably basic but can anyone assist with the following :

Find all real Roots, expressing as whole # and # under radical sign, not as fraction. and factor completely

f(x)= X^3-2x^2-15x+30

I got roots at 2 (x-2) and +/- √5

If someone solves and gets factored as
(x-2) (x^2-15) can you show me line by line how to factor x^2-15?

Thank you

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