factorise x^2-root2 x-12
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= x² - √2x - 12
= x² - 3√2x + 2√2x - 12
= x(x - 3√2) + 2√2(x - 3√2)
= (x - 3√2) , (x + 2√2)
= x = 3√2 , x = -2√2
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