exam Maths Puzzle Numerical Ability

find all numbers not in the domain of the function

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

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exam Other Question

factoring a quadratic with leading coefficient greater than one
2y^2+15y+28 1. Solve. (x + 4)^2 = 7
2. Find the constant term that should be added to make the following expression a perfect-square trinomial.
x^2 + 7x
3.Graph the following equation:
y = -x^2 + 6x