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The expression is likely 4x2 - 36x +81 which is the same as (2x - 9)(2x - 9) or (2x - 9)2
42% of 36x = 36x*42/100 = 15.12x%
It is 36x, exactly as in the question!
I'm guessing that's 36x^2 - 36x + 9 which factors to 9(2x - 1)(2x - 1)
36X 4 y + 32