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1 = 3(2x + 5) – 4x 5x + 15 – 4x 6x + 15 – 4x ? 1 = = 3(2x + 5) – 4x 10x + 15 6x + 15 – 4x 2x + 15 ? 2 = –5x (2x – 4) –10x2 + 20x ? –10x2 – 20x 3 = –3x + 7(x + 2) –3x +7x + 14 ? 4x (x + 2) 3 = = –3x + 7(x + 2) –3x +7x + 14 4x + 14 ? –10x + 14 4 = 13 (a – 2) 8 + 5(a – 2) 8 + 5a – 10 ? 4 = = 13a – 10 8 + 5(a – 2) 8 + 5a – 10 –2 + 5a ? 5 = 5(y + 6) + 3(y + 4) 5y + 30 + 3y + 12 ? 5y + 6 + 3y + 4 5 = = 5(y + 6) + 3(y + 4) 5y + 30 + 3y + 12 8y + 42 ? 35y + 15 6 = 4b + 18 – 3b + 5 2(2b + 9) – 3(b + 5) 4b + 18 – 3b – 15 ? 6 = = 7b + 33 2(2b + 9) – 3(b + 5) 4b + 18 – 3b – 15 b + 3 ? 7 = 12ab – 18b2 + 30bc ? 12ab – 18b + 30bc 6b(2a – 3b + 5c) 8 = –6a – 2b – 10c – a + b – 2(3a – b + 5c) – (a + b) –6a + 2b – 10c – a – b ? 8 = = – 2(3a – b + 5c) – (a + b) –6a + 2b – 10c – a – b –5a + b – 10c –7a + b – 10c ? 9 = 9x(2x + y – 5z) 12x2 – 3x(2x + y – 5z) 12x2 – 6x2 – 3xy + 15xz ? 9 = = 12x2 – 3x(2x + y – 5z) 12x2 – 6x2 – 3xy + 15xz 6x2 – 3xy + 15xz ? 18x2 – 3xy – 15xz 10 + 2 x x2 ? + 2x ? x (x + 4)(x + 2) = + 8 ? + 4 + 4x ? 10 + 2 (x + 4)(x + 2) = x + 2x x2 = x x2 + 6x + 8 ? x2 + 2x + 8 + 4x + 8 + 4 11 = 2x(2x – 3) – 3(2x – 3) (2x – 3)(x + 5) 2x(x + 5) – 3(x + 5) ? 11 = = 2x2 + 10x – 3x + 15 (2x – 3)(x + 5) 2x(x + 5) – 3(x + 5) 2x2 + 10x – 3x – 15 ? 11 = = = 2x2 + 7x – 15 ? 2x2 +13x – 15 2x2 + 10x – 3x – 15 (2x – 3)(x + 5) 2x(x + 5) – 3(x + 5) |