Factors of X2 - 16 are (X + 4) and (X - 4).
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x2 + 8x - 9 factors to (x - 1)(x + 9) x2 - 1 factors to (x - 1)(x + 1) The LCM will be (x - 1)(x + 1)(x + 9) or x3 + 9x2 - x - 9 The GCF is (x - 1)
x2 - y2 = 16 then (x + y)*(x - y) = 16 This has an infinite number of solutions lying on the hyperbola.
x2 + 18x - 50 does not have rational factors.
If: x2 = 81 Then: x = 9 or x = -9
If that's -16x, that factors to (x - 8)(x - 8) or (x - 8)2