exam Maths Puzzle Numerical Ability

Find the coordinates of the other endpoint of the segment with the given endpoint and mid point m

t(6,2)
m(2,0)

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exam Other Question

i do not understand how to get the answer to the following:
9 - 8x = x^2
i know the answer is x=-9 and x=1 but i do not know how to get that answer
thank you give an example of a real number that is not a ratioinal number...