In mathematics, a radical expression is defined as any expression containing a radical (β) symbol - includes square roots, cube roots and so forth. Expressing in simplest radical form just means simplifying a radical so that there are no more square roots, cube roots, 4th roots, etc left to find.So β12 is in radical form. I think what you are asking for is to reduce the expression to its simplest radical form.So 12 = 4*3, β12 = β4 * β3.We can βreduceβ this by noting that β4 =2, so the expression becomes 2β3.This cannot be further reduced because 3 isnβt a square or divisible by a square, so 2β3 is the simplest radical form.