oblicz wartość wyrazenia -6-(2v5-1)2+(2v5-1)(2v5+1)+(2v5+1)2
te dwie dwójki za nawiasami powinny być do kwadratu prosze pomóżcie!!!!!!!!daje dużo punktów
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-6-(2√5-1)²+(2√5-1)(2√5+1)+(2√5+1)²=
-6-(20-4√5+1)+20-1+20+4√5+1=
-6-20+4√5-1+40+4√5=
14+8√5
-6-(2V5-1)^2 +(2V5-1)(2V5+1) +(2V5+1)^2 =
= -6-(20-4V5+1)+20-1+20+4V5+1 =
= -6-20+4V5-1+20-1+20+4V5+1 =
= -6+4V5-1+20+4V5 =
= 13+8V5
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