If ellipse (x^(2))/(16)+(y^(2))/(b^(2))=...

If ellipse `(x^(2))/(16)+(y^(2))/(b^(2))=1` and hyperbola `(x^(2))/(144)-(y^(2))/(81)=(1)/(25)` are confocal, then find the value of `b^(2)`.

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`5`

`7`

`9`

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