College Algebra / Alg 091 · Atom · ~20 seconds
The Sum of Squares
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State
A sum of squares does not factor over the real numbers: no product of real-coefficient binomials multiplies back to a² + b².
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x² + 9 stays whole. Every candidate pair fails the multiply-back check — and for every real x, the value sits at 9 or above, never crossing zero.
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