Preview question: Find all rational zeros.f = x4 - 7x3 + 3x2 + 21x - 18

Behaviour being used: Adaptive mode

Minimum fraction: 0

Question summary: Find all rational zeros. f = x4 - 7x3 + 3x2 + 21x - 18: -6, 1; No rational zeros; 6, -1; 6, 1

Right answer summary: 6, 1

Question state: todo