Teacher's Guide - Pearson

7. j 5 258. w 5 ​7__4 ​9. n 5 ±810. x 5 ​2__5Exercise 17.2 (Student’s Book page 307)1. (k – 4)(k – 2) 5 0∴ k 5 4 or k 5 22. (x 1 1)(x 1 4) 5 0∴ x 5 21 or x 5 243. (2m 1 1)(m 1 5) 5 0∴ m 5 2​1__ ​ or m 5 2524. (3a 1 2)(a 2 2) 5 0∴ a 5 2​ 2 __3 ​ or a 5 25. (w 2 11)(w 1 11) 5 0∴ w 5 ±11Exercise 17.3 (Student’s Book page 308)1. x 2 1 7x 2 30 5 0∴ (x 1 10)(x 2 3) 5 0∴ x 5 210 or x 5 32. c 2 112c 2 64 5 0∴ (c 116)(c 2 4) 5 0∴ c 5 216 or c 5 43. a 2 2 14a 2 32 5 0∴ (a 216)(a 1 2) 5 0∴ a 516 or a 5 224. b 2 5 36∴ b 5 ±​√ ___36 ​ 5 ±65. x 2 2 49 5 0∴ (x 2 7)(x 1 7) 5 0∴ x 5 ±76. y 2 2 y 2 12 5 0∴ (y 2 4)(y 1 3) 5 0∴ y 5 4 or y 5 237. g 5 528. m(m 2 5) 5 0∴ m 5 0; m 5 5Chapter 17: Quadratic equations103