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7(x + 3)(x - 3)
7 x 7 x 7 = 343
k = 7 x^4 - 5x^3 + 7x^2 + 3x - 10 = (x + 1)(x - 2)(x^2 - 4x + 5)
(x - 7)(x2 + 7x + 49)
7 x 10^7