book Maths Puzzle Numerical Ability

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

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book Other Question
4x(y) + 2x(-5y) During the summer Tom mows lawns in his neighborhood. When he works he charges a flat fee of $27 plus a fee of $6 for each 100 square feet he mows. Yesterday he mowed the lawn of