9x2 = 81
x2 = 9 <-- Divide both sides by nine
x = 3 <-- Square root both sides
All in all this is NOT a difficult equation.
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x2=-81take the square root of both sidessince 81 is negative you need to take 81 times i when i=-1 then solve as the square root of 81. your answer is x=9i
81 x 81 = 6561
x2 + 9x2 = 10x2
812 = 81 x 81 = 6,561
9x2-9x = 0 x2-x = 0 x(x-1) = 0 x = 1 or x = 0