Features of Quadratics and Their Expression

How do I find the y-value of the vertex?

• factor

• x = -b / 2a gives you the y-value of the vertex

• find x = -b / 2a and then plug in for x and solve for y.

• find -b / 2a and then plug in for y and solve for x.

What was the height of the water at 3 seconds?

• 9 feet

• 10 feet

• 7 feet

• 5 feet

What is the equation for axis of symmetry?

• y=3

• x=3

• x=5

• x=1

Which of the following equations matches standard form of a quadratic?

• ax + by = c

• y = a(x - h)² + k

• y = ax² + bx + c

• y = mx + b

Identify the y-intercept.

• (0,3)

• (3,0)

• (1,0)

• (2,-1)

Write a quadratic equation given the x intercepts and one other point.

Step 1: Write the factors.

The intercepts of this function are (6, 0) and (8, 0). Write the factors.

• (x-6) and (x-8)

• (x+6) and (x+8)

• (x-6) and (x+8)

• (x+6) and (x-8)

What do you call the graph of quadratic functions?

• hyperbola

• parabola

• vertex

• ellipse

Which equation could match the graph?

• y = (x + 1)(x + 4)

• y = (x - 1)(x - 4)

• y = (x - 4)(x - 4)

• y = (x + 2.5)(x + 4)

Name the vertex to the given quadratic graph

• (2,3)

• (3,2)

• (0,-1)

• (4,-1)

Which parabola would open down?

• f(x)=x²

• f(x)=-x²+3x-6

• f(x) = x²-16

• f(x)=2x²-5x+7