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(36-16*5^(½))^(¼)*(4+2*5^(½))^(½)=
musisz zauważyć, że 36-16√5=(4-2√5)²
zatem :
⁴√36-16√5 *√4+2√5=⁴√(4-2√5)² *√4+2√5=√I4-2√5I *√4+2√5=
√2√5-4 *√2√5+4=√(2√5-4) *(2√5+4)=√20-16=√4=2
uwaga
I4-2√5I=2√5-4