Lesson 3

1. Lesson 3

1.7. Explore 4

Mathematics 20-2 M3 Lesson 3

Module 3: Quadratics

Self-Check 2

Complete “Your Turn” on page 331 of the textbook. Answer
For the graph of the quadratic function y = 2.6x2 − 6.2x − 2.2, use a graphing calculator to find the following to two decimal places:
1. first x-intercept
2. coordinates of the vertex
3. second x-intercept
Answer

Try This 2

Sometimes you will come across a question where you don’t know how to solve the quadratic function to find the required answer. In these cases, your graphing calculator can be a great help. Use the applet Goal to see how a graphing calculator can be used to determine how far from the net a hockey player needs to be in order to score a goal.

Hemera/Thinkstock

Did You Know?

The fastest hockey shot ever officially recorded was by Boston Bruins defenseman Zdeno Chara at a blistering 170 km/h. There is a controversy over that record, because Bobby Hull is reported to have shot a puck at the staggering speed of 190 km/h while skating at high speed down the ice.

This photograph shows a hockey player shooting the puck while another play attempts to block the shot.