exam Maths Puzzle Numerical Ability

Simplify:

(2x+4y)^2

thanks a lot!

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exam Other Question

2x+3y=21
-3x-6y=-24 Please help!
Which of the following is NOT true about the hyperbola:
(y^2/25)-x^2=1
1. It has vertices at (0,+-5)
2. It opens to the right and the left
3. Its foci are at (0,+