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(3^2x)^2 -10.3^2.(3^2x) + 729 = 0
a^2 - 90a + 729 = 0
(a-81)(a-9)=0
A= 81,9
3^2x = 3^4
2x = 4
x = 2
3^2x = 9
3^2x = 3^2
2x = 2
x = 1
x1 > x2
x1 = 2
x2 = 1
3x1 - x2 = 3(2)-1=5
A