0
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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