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1. i. x² + x – 6 = 0
☞ x² + x – 6 = x² – 2x + 3x – 6 (split the middle term)
☞ x² – 2x + 3x – 6 = x(x – 2) 3(x – 2)
☞ x(x – 2) 3(x – 2) = (x+3)(x–2).
ii. 100x² – 20x + 1 = 0
☞ 100x² – 20x + 1 = 100x²–10x–10x+1 (split the middle term)
☞ 100x²–10x–10x+1 = 10x(10x–1) –1(10x–1)
☞ 10x(10x–1) –1(10x–1) = (10x–1)(10x–1)
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