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What term should be subtracted from `sqrt72` to get `sqrt32`

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`sqrt72 - sqrt32 = sqrt(36 xx 2) - sqrt(16 xx 2) = 6sqrt2 - 4sqrt2 = 2 sqrt2`
Hence `2sqrt2` should be subtracted from `sqrt72` to get `sqrt32`
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CALCUTTA BOOK HOUSE-QUADRATIC SURDS-Exercise -3.2
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