=1⇒16b2+a2=a2b2‌‌‌⋅⋅⋅⋅⋅⋅⋅(i) at point (−2,2),‌
4
a2
+‌
4
b2
=1 ‌⇒‌‌4b2+4a2=a2b2 ‌⇒‌‌16b2+a2=4a2+4b2‌‌‌⋅⋅⋅⋅⋅⋅⋅(ii) From equations (i) and (ii) ‌⇒‌‌3a2=12b2⇒a2=4b2 ‌b2=a2(1−e2)⇒e2=‌