exam Maths Puzzle Numerical Ability

please help me solve for x the equation 22=(9+x)x

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exam Other Question

can you tell me if my answer is correct.
determine the horizontal asymptotes of:

f(x)= 2x^+3
_____
4x^2+5
f(x)= 2x^2+3 2 1
______= ___ or ____
4x^2+5 4 2

y=1/2
</PRE> How do I factor completely x^8-1?