exam Maths Puzzle Numerical Ability

Simplify:
x^2-5x-6 divided by x^2-11x+30
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x^2-2x-3 x^2-x-20

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exam Other Question

abs value of 2y+7 = 9 f(x)=x^2+3 ; g(x)=x+4
find (fog)(-2)

I am some what familiar doing the (fog)(x). I have never done any like this before. Are you just supposed to put -2 in for x. If so it shou