Here we will look at some more complicated circle questions. The videos from the previous circles blog will help.
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.