Higher Mathematics
Videos created by K Oppo & N Lyons available via youtube channel:

Quadratics & Polynomials
Video 1 – Sketching quadratics

Video 2 – Solving quadratic inequalities

Video 3 – The discriminant

Video 4 – Completing the square

Video 5 – The equation of a parabola

Video 6 – Intersection of lines and parabolas

Video 7 – Polynomials and synthetic division

Video 8 – Finding unknown coefficients

Video 9 – Find the intersection of curves

Video 10 – Determining the equation of a curve