x2 + 16x - 348 cannot be factored.
Solving for x with the quadratic formula results in x = -8 - 2√103 and x = -8 + 2√103
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x3 + 4x2 - 16x - 64 = (x + 4)(x + 4)(x - 4).
4x^2 = 16x 16x - 60x = -44x -44x + 225
No solution in integers.
(3x + 1)(x + 5)
(x + 5)(3x + 1)