Algebra 8.5 Notes: Graphing Parabolas

 $f\left(x\right)=x^2-2x-24$ 
 

On page 14, #1, this function is in which form?

• Intercept Form

• Standard Form

• Vertex Form

 $f\left(x\right)=x^2-2x-24$ 
 

What are the values of a, b, and c?

• a = 0, b = 2, c = 24

• a = 0, b = -2, c = -24

• a = 1, b = 2, c = 24

• a = 1, b = -2, c = -24

 $f\left(x\right)=x^2-2x-24$ 
 

Does this open up or down, and why?

• Up: because a is negative

• Down: because a is negative

• Up: because a is positive

• Down: because a is negative

Tags

CCSS.HSF-IF.C.7A

 $f\left(x\right)=x^2-2x-24$ 
 

Is the vertex a minimum or maximum? 

• minimum

• maximum

 $f\left(x\right)=x^2-2x-24$ 
 

Use the formula  $x=-\frac{b}{2a}$  to find the x-coordinate of the vertex.

(a)  

 $f\left(x\right)=x^2-2x-24$ 
 

You found that the x-coordinate of the vertex was x = 1.
Find the y-coordinate.

(a)  

 $f\left(x\right)=x^2-2x-24$ 
 

Which value is the y-intercept of the parabola?

• a

• b

• c

Tags

CCSS.HSF-IF.C.7A

 $f\left(x\right)=x^2-2x-24$ 
 

Which coordinate is the copy of the y-intercept?

• (-2, -24)

• (2, -24)

• (-24, 2)

• (24, 2)

Tags

CCSS.HSF-IF.C.7A

 $f\left(x\right)=-\left(x-4\right)^2+6$ 
 

On page 14, #2, this function is in which form?

• Intercept Form

• Standard Form

• Vertex Form

 $f\left(x\right)=-\left(x-4\right)^2+6$ 
 

Does this open up or down, and why?

• Up: because a is negative

• Down: because a is negative

• Up: because a is positive

• Down: because a is negative

Tags

CCSS.HSF-IF.C.7A