Oblicz wedlug wzorów skróconego mnożenia:
a) (2√5+1)2 =
b) (3+2√3)2 =
c) (2√5+3√7)2 =
wzory:
(a+b)2 = a2 + 2ab + b2
(a-b)2 = a2 - 2ab + b2
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a) 2√5*2√5 + 2*2√5 + 1 = 4*5+4√5+1=20+1 + 4√5
=21 + 4√5
b)3*3 + 2*3*2√3 + 2√3*2√3= 9+12√3+12
= 21+12√3
c)2√5*2√5 + 2*2√5*3√7 + 3√7*3√7 = 4*5 + 12√35 + 9*7 = 20+63 + 12√35
=83 + 12√35