Inequalities and Simultaneous Equations (C3)

Question 1

How can you find how many times two lines intersect?

Answer 1

Plug the values of the quadratic into the discriminant of the quadratic formula.
If ans = 0 they meet at 1 point.
If ans < 0 they don’t meet at all.
If ans > 0 they meet at 2 points.

Question 2

What is the quadratic formula?

Answer 2

x = -b + or - the square root of b^2 - 4ac all over 2a

Question 3

What is the discriminant?

Answer 3

Square root of b^2 - 4ac