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Turn it around for my convenience.

81X^2 - 25 = 0

add 25 to each side

81X^2 = 25

divide both sides by 81

X^2 = 25/81

take square root both sides

X = sqrt(25/81

express as

X = sqrt(25)/sqrt(81)

do it

X = 5/9

----------------check in original equation

81(5/9)^2 - 25 = 0

81(25/81) - 25 = 0

25 - 25 = 0

0 = 0

checks

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Q: What is 0 equals 81x squared-25?
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