Radicand. The number under the symbol.That is, a number which is having its square root taken or cube root, 4th root, 5th root, nth root, etc..For example, 3 is the radicand in. See also. Argument of a function, extraneous solution. So, we’ve got the radicand written as a perfect square times a term whose exponent is smaller than the index. The radical then becomes, $\sqrt y^7 = \sqrt \left y^3 \right^2y$ Now use the second property of radicals to break up the radical and then use the first property of radicals on the first term. Find radical or roots of numbers. Just enter the radical and radicand into the calculator. Free online calculators for radicals, exponents, math, fractions, factoring, plane geometry, solid geometry, algebra, finance and more. Calculator roots. Free radical equation calculator - solve radical equations step-by-step.