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(3-√7)(2+2√7) = 6 - 2√7 + 6√7 - 2 * 7 = 6 - 4√7 - 14 = - 8 - 4√7 = - 4(2 + √7)
b)
(√3+2√2)(4√3-√2) = 12√3 + 8√6 - 3√2 - 2 * 2 = 12√3 + 8√6 - 3√2 - 4 =
= 3(4√3 - √2) + 4(2√6 - 1)
c)
(√6-2√3)(2√6+6√3) = 2 * 6 - 4√18 + 6√18 - 12 * 3 = 12 + 2√18 - 36 =
= 6√2 - 24 = 6(√2 - 4)
d)
(5√2-2√10) (-3√10-2√3) = - 15√20 + 6√100 - 10√6 + 4√30 =
= - 30√5 + 60 - 10√6 + 4√30 = 30(2 - √5) + 2(2√30 - 10√6) =
= 30(2 - √5) + 2√6(√5 - 5)