2014 · Q20
If the roots of the equation Ax^2 + Bx + C = 0 are -1 and 1, then which one of the following is correct?
Elementary MathematicsAlgebra
- AA and C are both zero
- BA and B are both positive
- CA and C are both negative
- DA and C are of opposite sign
Explanation
Sum of roots 0 gives B = 0; product -1 = C/A gives C = -A, so A and C have opposite signs.