48
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9x2 - 6xy + y2 - 81 = (3x - y)2 - 81 = (3x - y - 9)*(3x - y + 9)
Answer : 12
Do you mean 3x = 45 then if so divided both sides by 3 to find the value of x which is 15
x2 - 3x - 40 = (x - 8) (x + 5)
(5x 2 - 8x + 1) + (2x 2 - 4x - 11)