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q=a_{n+1} : an
q=(2√2-2) :√2=2-2/√2=2-2√2/2=2-√2
Nastepny wyraz po an
an*q
a₁=√2
a₂=√2*(2-√2)=2√2-2
a₅=a₁*q⁴
a₅=√2(2-√2)⁴=√2(2-√2)²*(2-√2)²=√2(4-4√2+2)²=
√2(6-4√2)²=√2(36-2*6*4√2+16*2)=√2(68-48√2)=68√2-48*2
Odp. a₅=-96+68√2.