Find all of the roots of x6 − 25x4 − 625x2 + 15,625 = 0. (Hint: Rearrange the terms with a sum of cubes followed by the two other terms. Factor the sum of cubes and factor the GCF from the two other terms. Then factor by grouping.) The roots with multiplicity 2 are ___ and ___. The roots with multiplicity of 1 are ___ and ___.