Question 317455
2a^2-a-15
*[invoke quadratic "a", 2, -1, -15]
2.30c^2+19c-63
*[invoke quadratic "c", 2.3, 19, -63]
3.20c^2-13c-15
*[invoke quadratic "c", 3.2, -13, -15]
5c^2+18c-35
*[invoke quadratic "c", 5, 18, -35]