proof of square root of square root binomial
We square the expression on the right-hand-side and expandusing the binomial formula:
Since the squaring operation undoes the square roots, weobtain the following:
Since the product of square roots equals the square rootof the product, we have the following:
Combining what we have calculated above, we obtain
Because the square of the asserted value of the square root equals the radicand () of the square root, and the asserted value of the square root is clearly non-negative, we have justified the validity of the formulas