(81x^2)-25=0 what is the solution set

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1 Answer

81x^2=25; square root of each side: 9x=5 or 9x=-5. Therefore x=5/9, -5/9.

Another way: 81x^2-25=0; (9x-5)(9x+5)=0, so x=5/9,-5/9.
by Top Rated User (1.2m points)

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