Getting Ready: Quadratic Formula

Getting Ready:
Quadratic Formula

It looks scary, but it is not scary!

Let's review somethings before we jump into it.

You will need to know how to:
-Find the parts of a quadratic equation
- Solve equations
- Square a number
- Use the square root

Quadratic Formula

Finding Parts of a Quadratic Function

Match

Name the a, b, and c values in the following equation:

• a value

• b value

• c value

1

7

5

• 1

• 7

• 5

Multiple Choice

Identify c:

$$2x^2+4x+3=0$$  

• c= 4

• c= 3 

• c = 2 

• c = 1 

Multiple Choice

$$x^2-6x+\ 2=0$$  

identify a:

• a = 1

• a = 6

• a = -6

• a = 2

Multiple Choice

$$x^2-6x+\ 2=0$$  

identify b:

• b = 1

• b = 6

• b = -6

• b = 2

Multiple Choice

$$x^2-6x+\ 2=0$$  

identify c:

• c = 1

• c = 6

• c = -6

• c = 2

Dropdown

Find "a", "b", and "c" of this quadratic equation:

$$x^2+2x+5$$
a = ​ ​

Select answer

, b = ​

Select answer

, c = ​

Select answer

Dropdown

Find "a", "b", and "c" of this quadratic equation:
$$-2x^2+9x-1$$

Select answer

, b = ​

Select answer

, c = ​

Select answer

Multiple Choice

$$-3x+2\ =\ -x^2$$  Rewrite in standard form:

• $$x^2-3x+2=0$$  

• $$-x^2-3x+2=0$$  

Squaring a Number

When we have x², it is not 2 times x. It is x times itself twice.

For example:

3² = 3 x 3 = 9, NOT 3 x 2
8² = 8 x 8 = 64, NOT 8 x 2
(-5)² = (-5)(-5) = 25, NOT -5 x 2

Multiple Choice

5² = 10

• True

• False

Multiple Choice

6² =

• 36

• 12

• 32

• 8

Finding the Square Root:

Multiple Choice

Find the square root of √25.

• 5

• 4

• 25

• 1

Multiple Choice

What is the square root of √9?

• 3

• 1

• 4

Multiple Choice

What is the square root of √36?

• 6

• 9

• 4

• 12