3x² - 22x - 16 = (3x + 2)(x - 8)
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This is a difference of two squares, which factorises to: (3x - 4y)(3x + 4y)
It is: 3y(2y-3x) when factored
If you mean 9x^2-24x+16 then yes it can because its discriminant is equal to zero and it is (3x-4)(3x-4) when factored
(3x-4)(3x+4)
(27x3 - 64) = [(3x)3 - 43] = (3x - 4)[(3x)2 + (3x)(4) + 42] = (3x - 4)(9x2 + 12x + 16)