(4x-5)^2-5x(3x-8)
(16x^2-40x+25)-(15x^2-40x)
16x^2-15x^2-40x+40x+25
x^2+25
if x = positive, x^2 will be positive.
if x = negative, x^2 will be positive.
x^2 is positive for all values of X, +25 will not make it negative.
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