Intro to Quadratic Formula

Quadratic Formula

Section 2.6

Quadratic Formula

Multiple Choice

Given the quadratic

$$f\left(x\right)=2x^2-8x+13$$  , what is the "b" value?

• b = 2

• b = -8

• b = 13

• b = 8

Multiple Choice

What is the value of (-3)^2?

• 9

• -9

• 6

• -6

Multiple Choice

What is the value of -(-7)?

• -7

• 7

• 8

• -8

1) Determine the a, b, & c values

3) Simplify under the radical

When you have a perfect square under the radical, you can find two separate answers

Poll

Are we ready to try some!?!

• Yes!

• Maybe

• I think I need more practice

Multiple Choice

What are the x-intercepts of

$$f\left(x\right)=4x^2-x-7$$  ?

• $$x=\frac{1\pm\sqrt{113}}{2}$$  

• $$x=\frac{1\pm\sqrt{111}}{8}$$  

• $$x=\frac{1\pm\sqrt{113}}{8}$$  

• $$x=\frac{4\pm\sqrt{111}}{2}$$  

Multiple Choice

What are the zeros of

$$f\left(x\right)=-2x^2+3x+1$$  ?

• $$x=\frac{3\pm\sqrt{17}}{4}$$  

• $$x=\frac{-3\pm\sqrt{18}}{4}$$  

• $$x=\frac{3\pm\sqrt{17}}{-4}$$  

• $$x=\frac{3\pm\sqrt{18}}{2}$$  

Multiple Choice

What are the zeros of

$$f\left(x\right)=x^2+7x-18$$  ?

• $$x=-2,\ -9$$  

• $$x=2,\ -9$$  

• $$x=-2,\ 9$$  

• $$x=2,\ 9$$  

Poll

How did you do?

• Great! I got this!

• I need more practice