10.07.2015 Views

Teacher's Guide - Pearson

Teacher's Guide - Pearson

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4. ​1__ ​(2 1 x)x 5 242∴ x 2 1 2x 2 48 5 0∴ (x 1 8)(x 2 6) 5 0∴ x 5 6 (only solution)Height 5 6 m; Base 5 8 m5. a) x 2 63 33 3b) 3 cmc) V 5 (x 2 6) 2 3 35 3(x 2 2 12x 1 36)∴ 3x 2 2 36x 1 108 5 48∴ x 2 2 12x 1 36 5 16∴ x 2 2 12x 1 20 5 0∴ (x 2 10)(x 2 2) 5 0∴ x 5 10d) Cardboard is 10 cm 3 10 cmChapter 17: Quadratic equations107

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