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-x2 + 6x + 16 = -(x2 - 6x - 16) = -(x - 8)(x + 2) = -(8 - x)(x + 2)
x2 - 6x - 16 = (x - 8)(x + 2)
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
4x+8
First, factorising, we get: x2 - 6x - 16 = (x - 8)(x + 2). Then, (x2 - 6x - 16) / (x - 8) = x + 2.