exam Maths Puzzle Numerical Ability

Please help me solve this equation:Add and simplify your answer
(6+5x+6x^2+8x^3)+ (3-5x+6x^2-8x^3)

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exam Other Question
from my graph I am to predict the y value for an x value of -2. I am not sure what to do. Hi! I need some help simplifying and reducing to lowest terms these equations...

1/(x+5y)-5/(x-5y)+3/(x^2-25y^2)

and

[(x^3+27)/(x+3)]/[(x^2-3x+9)/(x-3)]

thanks so much