Mathematics for IGCSE & O level - Equations (Section 4 - No. 26)
Which elements are necessary to compute the solutions to a quadratic equation using the quadratic formula?
The constant term.
The coefficient of the x² term (a).
The discriminant.
The coefficient of the x term (b).
解释
You need 'a', 'b' (and implicitly the 'c' which helps form the discriminant).