Wykonaj działania: a) (3-√7) (2+2√7) b) (√3+2√2) (4√3-√2) c) (√6-2√3) (2√6+6√3) d) (5√2-2√10) (-3√10-2√2) proszę pomóżcie
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a)
(3 - √7) (2 + 2√7) = 6 + 6√7 - 2√7 - 14 = 4√7 - 8
b)
(√3 + 2√2) (4√3 - √2) = 12 - √6 + 8√6 - 4 = 7√6 + 8
c)( √6 - 2√3) (2√6 + 6√3) = 12 + 6√18 - 4√18 - 12√9 = 12 + 2√18 - 36 = 6√2 - 24
d)
(5√2 - 2√10) (-3√10 - 2√2) = - 15√20 - 20 + 60 + 4√20 = - 11√20 + 40 = - 22√5 + 40