Question

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Answer 1

$4^{n}- 2^{2n+1}+1 = (2^{n})^{2}-2* 2^{n}*1+ 1^{2} = ( 2^{n}-1)^{2}$ -patrat perfect.

*Am aplicat formula $(a-b)^{2}= a^{2}-2ab+ b^{2}$.

Answer 2

=2^2n-2^2nx2+1=
=2^2n(1-2)+1=
=-2^2n+1 este patrat perfect