Answer :
[tex]2n\cdot(2n+2)=728\\
4n^2+4n-728=0\\
n^2+n-182=0\\
n^2+14n-13n-182=0\\
n(n+14)-13(n+14)=0\\
(n-13)(n+14)=0\\
n=13 \vee n=-14\\\\
2n=26 \vee 2n=-28\\
2n+2=28 \vee 2n+2=-26[/tex]
26 nad -28 or -26 and 28
26 nad -28 or -26 and 28