Polynomials - Rational Root Theorem
https://www.radfordmathematics.com/algebra/polynomial-functions-equations/polynomials-rational-root-theorem.html
WEBRational Root Theorem. If a polynomial functions has integer coefficients, an, an−1, a n, a n − 1, ... a1, a0 a 1, a 0, such that an ≠ 0 a n ≠ 0 and a0 ≠ 0 a 0 ≠ 0 : f(x) = anxn +an−1xn−1 + ⋯ +a2x2 +a1x +a0 f ( x) = a n x n + a n − 1 x n − 1 + ⋯ + a 2 x 2 + a 1 x + a 0. then any rational solution to the equation:
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