exam Maths Puzzle Numerical Ability

Hi. Could you please help me with this problem? The problem is "find the foci for the hyperbola 2x to the second power - 4y to the second power = 36.
Please help. Thank you!

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exam Other Question
Solve by substitution:
5x+2y=7
4x-y=3 Divide;

x^2 + 2x - 15 x^2 - 25
------------- / ---------
4x^2 2x - 10

This problem has lost me on all senses to figure it out, can anyone help me with this one please? Thank you very much