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b)
a)
(√3 + 2√2)(4√3 - 8√2) =
= √3 * 4√3 - √3 * 8√2 + 2√2 * 4√3 - 2√2 * 8√2 =
= 4 * 3 - 8√6 + 8√6 - 16 * 2 =
= 12 - 32 = - 20
b)
(2√5 - 4√2)(2√2 + √5) =
= 2√5 * 2√2 + 2√5 * √5 - 4√2 * 2√2 - 4√2 * √5 =
= 4√10 + 2 * 5 - 8 * 2 - 4√10 =
= 10 - 16 = - 6