Summary: Review
Key Concepts- Quadratic functions of form may be graphed by evaluating the function at various values of the input variable to find each coordinating output . Plot enough points to obtain the shape of the graph, then draw a smooth curve between them.
- The vertex (the turning point) of the graph of a parabola may be obtained using the formula
- The graph of a quadratic function opens up if the leading coefficient is positive, and opens down if is negative.
- Quadratic functions may be used to model various real-life situations such as projectile motion, and used to determine inputs required to maximize or minimize certain outputs in cost or revenue models.
Glossary
- projectile motion
- (also called parabolic trajectory) a projectile launched or thrown into the air will follow a curved path in the shape of a parabola
- quadratic function
- a function of form whose graph forms a parabola in the real plane
- vertex
- the turning point of the graph of quadratic function