exam Maths Puzzle Numerical Ability

4x2+y2+24x-4y+24=0

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r-3 is this a exponent. Q1):
points A(8,-3), B(-2,-8), C(-4,3), and D(6.8) are the vertices of a quadrilateral.......
a) determine the equations of the diagonals.
b) is AC the perpendicular bisector of