According to the Rational Root Theorem, possible rational roots of x³ − 4x² + x + 6 = 0 must come from:
A ±1, ±2, ±3, ±6
B ±1, ±2 only
C ±1, ±4, ±6
D any integer
Explanation
Rational Root Theorem: candidates are ±(factors of constant) / (factors of leading coefficient). Constant is 6, leading is 1, so candidates are ±1, ±2, ±3, ±6.