exam Maths Puzzle Numerical Ability

Graph Each Function and give the approximate coordinates of the vertex.

41. f(x)=x^2-x+9

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exam Other Question

i need to find the Foci of 25x2+16y2+150x=160y-225
the 2 that is next to 25x and 16y is supposed to be squared but i didn't no how to do it. thanks for you help. Divide.

M8N6/M4N2 This is division with powers of numbers?????? The first mn group is over the second mn group.?!