exam Maths Puzzle Numerical Ability

factoring a quadratic with leading coefficient greater than one
2y^2+15y+28

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exam Other Question

x/4 - y/11 = -9/44

x/6 - y/13 = -1/26
find all numbers not in the domain of the function

f(x)=x^2-16 over x^2-2x-8

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