exam Maths Puzzle Numerical Ability

(x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee

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exam Other Question

When the binomial (2x-3y)^11 is expanded, what is the coefficient of x^8y^^3 taking into consideration the coefficients 2 and -3. Thank you A board 20 feet long is cut into two pieces such that the lenght of one piece is two-thirds of the lenght of the other piece. find the lenght of the shorter piece of board.