HOYEONBABYIN HOYEONBABYIN Math Answered Determine the number of variations of signs. (1) x^3 - 2x^2 - 5x + 6 (2) 2x^3 + 13x^2 + 17x -12 (3) x^3 - x^2 + x - 1 (4) x^4 -4x^3 +7x^2 -16x + 12 (5) x^5 - 3x^4 + 3x^3 - 9x^2 + 2x - 6