Yesterday we looked at solving inequalities. This topic is often combined with use of the discriminant. The discriminant (D = b2 – 4ac) tells you how many roots a quadratic of the form ax2 + bx + c = 0 has.
D > 0, there are two distinct and real roots
D = 0, there is one repeated root
D < 0, there are no real roots
Watch the video below and then try the exam questions
Most question though are harder than this, take a look through some of these videos and then try the exam question below.