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单词 ProofOfSquareRootOfSquareRootBinomial
释义

proof of square root of square root binomial


We square the expression on the right-hand-side and expandusing the binomial formulaMathworldPlanetmath:

(a+a2-b2±a-a2-b2)2=(a+a2-b2)2
+(a-a2-b2)2±2a+a2-b2a-a2-b2

Since the squaring operation undoes the square roots, weobtain the following:

(a+a2-b2)2+(a-a2-b2)2=a+a2-b2+a-a2-b2=a

Since the product of square roots equals the square rootof the product, we have the following:

a+a2-b2a-a2-b2=a+a2-b2a-a2-b2
=a2-(a2-b)24
=a2-(a2-b)4
=b4=b2

Combining what we have calculated above, we obtain

(a+a2-b2±a-a2-b2)2=a±b.

Because the square of the asserted value of the square root equals the radicand (a±b) of the square root, and the asserted value of the square root is clearly non-negative, we have justified the validity of the formulas

a±b=a+a2-b2±a-a2-b2.
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更新时间:2025/5/4 4:46:18