Today:Warm-Up/Test Review

Khan AcademyClass Work

March 11, 2013

Warm Up

1. 2.

Warm Up

3. Find the length & width:

A = 70

x + 4

x + 1

(x + 4)(x + 1) = 70x2 + 5x + 4 = 70

Warm Up

4. 2x(x - 3) + 9(3 - x)

5. (x3 - 64x)

6. (x4 - 81) = (x2 - 9) (x2 + 9)

= (x + 3)(x + 3)(x2 + 9)

Khan: Poly 2

1. 3x3 + 6x2 –189x

2. -4x3 + 32x2 – 60x

3. 4x2 - 20x –56

4. -3x3 - 3x2 + 216x

Everyone who completes 8 consecutive or 25 total correct questions by

Tuesday, 7:00 pm, will receive 100%

***5. x2 - 6xy - 16y2

Review:

x2 + 10x + 25 A. What is a perfect square trinomial? 1. The first term is a perfect square 2. The third term is a perfect square 3. Multiply the square root of the 1st term coefficient by the square root of the 3rd term coefficient. The 2nd term should be twice this amount.

Perfect Square Trinomials :

Review:

Another shortcut for factoring a trinomial is when we want to factor the difference of two squares.

a2 – b2 = (a + b)(a – b)

A binomial is the difference of two squares if:

1.Both terms are squares and2.The signs of the terms are different.

Difference of Two Squares

9x2 – 25y2

– c4 + d4

Review:

Square of Sums:

1. (x + 1) 2

2. (3x + 1)2

All +, + perfect square trinomials factor into square of sum binomials.

The product of a Square of a Sum binomial (a + b)2 is:

a2 + 2ab + b2

Review:

Square of a Difference:

1. (x - 4) 2

2. (3x - 1)2

All -, + perfect square trinomials factor into square of difference

binomials.

The product of a Square of a difference binomial (a - b)2 is:

a2 - 2ab + b2

Test Review:

1. x3 – 3x2 –16x + 48

2. x2 – 7x + 10

3. 8x2 + 2x - 3

4. 3a3b2 + 21a3b + 36a3

Class Work:

Factoring Frenzy:

1-20; AllMust Show Work on Scratch

Paper!!