Simplest radical form means simplifying a radical so that there are no more square roots, cube roots, 4th roots and such left to find. It also means removing any radicals in the denominator of a fraction.
7square roots of 2
an alg expression involving square roots, cube roots, etc
If by "radical" you mean "square root of", then yes. Both square roots of 25 are real numbers.
In surd form, square roots need to be have the same radical term before you can add or subtract them. However, unlike in algebraic expressions, it is possible to add or subtract square roots using approximate (decimal) values.
That IS the simplest radical form.
The square root of 28 in simplified radical form is...2 * Square root of 7
You can't simplify it more in radical form
The square root of 125 in radical form is 5 x (square root of 5).
The square root of 15 is simply root 15, since neither 3 nor 5, 15's only factors, have square roots.
2i radical 5 * * * * * No. it is ± i*radical(25) which is ± 5i. Not sure why the answer is requireed in radical form.
5 radical(11)