It can be.
Yes.
Odd
negative
It is a root of a number where that root cannot be made into a rational number. For example, the cuberoot(27/64) is 3/4 and so is not a radical but cuberoot(32/64) = cuberoot(1/2) = 3√(1/2) cannot be simplified or rationalised further.
It can be.
Yes.
If by "radical" you mean "square root of", then yes. Both square roots of 25 are real numbers.
Odd
negative
-3*radical(2)*radical(50) = -3*radical(2*50) = -3*radical(100) = -3*10 = -30
It is a root of a number where that root cannot be made into a rational number. For example, the cuberoot(27/64) is 3/4 and so is not a radical but cuberoot(32/64) = cuberoot(1/2) = 3√(1/2) cannot be simplified or rationalised further.
radical 3 or 6
3^3*radical(128) = 3^3*radical(2^7) = 3^3*radical(2^6*2) =3^3*2^3*radical(2) = 216*radical(2).
The dividend is the number located under the radical in a division problem 12 divided by 3 = 4 the quotient would be 4 (the number above the radical) and the dividend would be 3
1
3