Mathematics for IGCSE & O level - Equations (Section 7 - No. 4)
Which of the following are correct statements about the quadratic equation?
A quadratic equation has at most two solutions.
If the discriminant is greater than zero, there are two real solutions.
A quadratic equation can always be solved by completing the square.
A quadratic equation always has two solutions.
Giải thích
A quadratic equation can have up to two real solutions. These solutions can be found by factorization, using the quadratic formula or completing the square.