Question

Calculate 4√28 - 3√7

Answer 1

$4 \sqrt{4 \times 7} - 3 \sqrt{7} \\ = 4 \times 2 \sqrt{7} - 3 \sqrt{7} = 8 \sqrt{7 } - 3 \sqrt{7} \\ = 5 \sqrt{7}$
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Answer 2

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