exam Maths Puzzle Numerical Ability

Please help me with this problem, im stuck.

Factor completely.

4a^2 + 12ab + 9b^2 - 25c^2

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exam Other Question

COULD YOU HELP ME WRITE THIS EQUATION?

FOR EACH POINT ITS DISTANCE FROM THE FIXED POINT IS (-1,-3) IS 1/2 OF ITS DISTANCE FROM THE FIXED POINT (5,-8). IS THIS GRAPH A CONIC SECT A real number that is not rational?