book Maths Puzzle Numerical Ability

Question:
Find the equation of the following conic section:
An ellipse with focus (+-7^1/2,0) and y-intercepts (0,+-3)

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book Other Question

i do not understand polynomials AT ALL so any help would greatly be appreciated
(2x squared +3x - 5)+ (7x squared -x+7)=
i tried it and this is what i got for the answer
9xsquar Here is another one I can't figure out as well. The point (1,2) has the distance ? from the line defined by {{{y=-(x/3)+1}}}