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# 2/15 Adv. Alg Bell Ringer - PowerPoint PPT Presentation

2/15 Adv. Alg Bell Ringer. Solve the following quadratic equations: x 2 + 7x + 12 = 0 x 2 – 8 = -2x. Homework: Quadratic Formula Independent Practice. 2/15 News and Notes. Perfection Award: 1 st Period HW Checked? Quiz Make-ups and retakes today in 218

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## 2/15 Adv. Alg Bell Ringer

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### 2/15 Adv. Alg Bell Ringer

x2 + 7x + 12 = 0

x2 – 8 = -2x

2/15 News and Notes
• Perfection Award: 1st Period
• HW Checked?
• Quiz Make-ups and retakes today in 218
• Need to serve a detention? Today in 218
Quiz Make-ups
• 2nd: Ronnell, Jasmin H, Melissa, Masamusa, Durante, Zuleima, Edna.
• 4th: Janet, Taunjear, Tyte’Anna, Abi, Darneisha, Jesus, Ariel, Jasmine
Take 3 Minutes to solve
• Choose one of the quadratic equations to solve in the next 3 minutes:
• x2 – 9x + 3 = 0
• 3x2 – 5x = -8
You Just Got

TREATED!

TREATED!

TREATED!

These can’t be solved with our normal methods
• WE NEED THE QUADRATIC FORMULA
• This allows us to solve ANY quadratic equation.
• So what is it?!
• Pop Goes the Weasel – Quadratic Formula
• So what is it again?
Example #1
• Solve for x: x2 – 9x + 3 = 0
• Step 2: What are the values of a, b, and c
• A = 1
• B = -9
• C = 3
• Step 3: Plug in to Quadratic Formula
• Step 4: Solve!
Example 2

3x2 – 5x = 8

Step 1: Get in right form

3x2 – 5x – 8 = 0

Step 2: Find a, b, and c

A = 3

B = -5

C = -8

Step 3: Plug in to quadratic function

Guided Practice – Trace it back and forth…

I used the quadratic formula to solve an equation and got:

• With your partner write the values of a, b, and c.

(b) Now write the quadratic equation I started with.

With your partner write the values of a, b, and c.

a = 1 b = 8 c = 9

(b) Now write the quadratic equation I started with.

0 = x2 + 8x + 9