College Algebra / Unit 6 Alg 321 short lesson, about 20 seconds
Quadratic Functions and Parabolas
Captions available
The idea
A quadratic function is a polynomial function of degree two; its graph is a parabola, opening upward when a is positive and downward when a is negative.
In practice
f(x) = x² − 4x + 3 has a = 1, so its parabola opens upward — a cup, not a dome.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
Something wrong in this lesson? Flag it · Sources for College Algebra