Intro into Quadratic Functions

When I want to find the maximum or minimum height of an object, I should_____.

• Look at the x intercepts

• Look at the axis of symmetry

• Look at the y intercept

• Look at the y-coordinate for the vertex

• Look at the x-coordinate for the vertex

Which of the following mean the same as x-intercept? (More than one answer! Select all that are correct)

• Zero

• Root

• Axis of Symmetry

• Solution

• Maximum

Which one are we looking for?

Elliot wants to know how high the soccer ball will get if he kicks it straight up in the air.

• x at vertex

• y at vertex

• zeros/roots/x intercepts

• y-intercept

Which one are we looking for?

Isabella wants to know how long her toy rocket will be in the air after she lights the fuse to launch it from a 1.5-foot launch pad.

• x at vertex

• y at vertex

• zeros/roots/x intercepts

• y-intercept

Which one are we looking for?

Darrell is trying to find out how many seconds it will take a golf ball to get to its highest point after being hit on the golf course.

• x at vertex

• y at vertex

• roots/zeros/x intercepts

• y-intercept

Which one are we looking for?

Jaiden wanted to know the initial height of a baseball when it was hit at home plate.

• x at vertex

• y at vertex

• roots/zeros/x intercepts

• y-intercept

Which one are we looking for?

Matias is wondering how long it will take a football to hit the ground after throwing it at practice.

• x at vertex

• y at vertex

• zeros/roots/x intercept

• y-intercept

What does the Y intercept of the graph represent?

• The initial speed the bungee jumper is falling.

• The initial height of the bungee jumper

• The lowest point the bungee jumper falls before bouncing upwards.

• The bungee jumper's final height.

What does the y value of the vertex of the graph represent?

• The initial speed the bungee jumper is falling.

• The initial height of the bungee jumper

• The lowest point the bungee jumper falls before bouncing upwards.

• The bungee jumper's final height.

Does this parabola have a minimum or maximum and what is its value?

• minimum: 2
• maximum: 2
• minimum: 5
• maximum: 5