I assume you mean....,
8X + 16
8(X + 2)
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3x2 - 8x = x(3x - 8)
If you mean: xsquared+8x-48 then it factors to (x-4)(x+12)
(x+5)(x+3)
It is: 4(2x+3m) when factorised
Use www.wolframalpha.com Enter factor 4x^2+8x-5 to receive the answer (2x-1)(2x+5)