Question

$3 \sqrt{18} x - 7 \sqrt{32} x + 4 \sqrt{72} x - 2 \sqrt{50} x + 3 \sqrt{8}$
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Answer 1

$3 \sqrt{18} x - 7 \sqrt{32} x + 4 \sqrt{72} x - 2 \sqrt{50} x + 3 \sqrt{8} = - 19 \sqrt{2} x + 24 \sqrt{2} x - 2 \sqrt{50} x + 6 \sqrt{2} = 5 \sqrt{2} x - 2 \sqrt{50} x + 6 \sqrt{2} = \sqrt{2} (5x - 10x + 6) = \sqrt{2} ( - 5x + 6)$

sau

$= 9 \sqrt{2} x - 28 \sqrt{2} x + 24 \sqrt{2} x - 10 \sqrt{2} x + 6 \sqrt{2} = - 5 \sqrt{2} x + 6 \sqrt{2}$