215 Adv Alg Bell Ringer Solve the following
2/15 Adv. Alg Bell Ringer Solve the following quadratic equations: x 2 + 7 x + 12 = 0 x 2 – 8 = -2 x 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 Need to serve a detention? Today in 218
Quiz Make-ups • 2 nd: Ronnell, Jasmin H, Melissa, Masamusa, Durante, Zuleima, Edna. • 4 th: 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: 1. x 2 – 9 x + 3 = 0 2. 3 x 2 – 5 x = -8
You Just Got
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? !
2 Songs to help you • Pop Goes the Weasel – Quadratic Formula • Go on You. Tube tonight to find your favorite • So what is it again?
Example #1 • Solve for x: x 2 – 9 x + 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 3 x 2 – 5 x = 8 Step 1: Get in right form 3 x 2 – 5 x – 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: (a)With your partner write the values of a, b, and c. (b) Now write the quadratic equation I started with. (c) Simplify the quadratic formula to find your solutions.
(a)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 = x 2 + 8 x + 9 (c) Simplify the quadratic formula to find your solutions.
Independent Practice • # 1 - 6 in textbook • Skip #4 c, • BONUS: #5 c, 6 c, 1 e • Question 3 Process: 1. Can I factor? 2. If not, use Quadratic Formula • Question 4: Just writing #3 in factored form of a FUNCTION
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