Answers to Unit 1, Lesson 1 Exercises 3x2 – 5x + 6 -4x2 – 7x – 17 4y2 + y + 7 7z – 10 2x3 – 2x2 + 6x -12u2 + 3u -15x3 – 5x2 + 10x
Answers to Unit 1, Lesson 1 Exercises x2 + 8x + 15 8x2 + 14x + 3 x2 – 36 9x2 – y2 x2 + 4x + 4 9 – 30x + 25x2 u2 + v2 – 2uv + 4u – 4v + 4 a2 – b2 – 4a + 4
Answers to Unit 1, Lesson 1 Exercises 8x3 – 12x2y + 6xy2 – y3 8x3 – 84x2 + 294x – 343 x3 + 2x2 – 5x + 12 x2 – 2 x3 – 8 12
Unit 1, Lesson 2 : Factoring using GCF and Factoring Trinomials Factoring is rewriting an expression as the product of its factors. The greatest common factor (GCF) of an expression is the common factor with the greatest coefficient and the greatest exponent.
Examples: Factor . 1. 4x2 + 20x – 12 2. 9n2 – 24n
You try: 9x3 + 18x2 – 3x 7p2 + 21
Factoring Trinomials ax2 + bx + c , when a = 1 Examples: 5. x2 + 8x + 7 6. x2 – 17x + 72 7. x2 – x – 12
You try: x2 – 11x + 24 x2 + 3x – 10 x2 + 18x + 32
Factoring Trinomials ax2 + bx + c , when a 1 Examples: 3x2 – 16x + 5 12. 4x2 – 4x – 15
You try: 4x2 + 7x + 3 4x2 + 5x – 6
Perfect Square Trinomials 4x2 + 12x + 9 16. 9x2 – 6x + 1
Difference of Squares: a2 – b2 = (a – b)(a + b) 17. x2 – 64 16. 4x2 – 49
Factoring Completely Always look for GCF first!! 9x2 – 36 16x2 – 80x + 100
Homework Practice 5-4 odds only!