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OpenStudy (loisvanpaige):
Simplify the product. (2 + sqrt 10)(2 – sqrt 10)
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OpenStudy (solomonzelman):
these are conjugates. Use \(\LARGE\color{blue}{ \bf (a+b)(a-b)=a^{2}-b^{2} }\) your "a" is 2, and your "b" is √10 .
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