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Step-by-step explanation:
1. (√7+√2)(√14-√8)
=(√7+√2)(√14-√2²×2)
=(√7+√2)(√14-2√2)
=√7(√14-2√2)√2(√14-2√2)
=√98-2√14+√28-2√4
=√7²×√2-2√14+√7×√2²-2√2²
=7√2-2√14+2√7-2×2
=7√2-2√14+2√7-4
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