exam Maths Puzzle Numerical Ability

I need help solving this equation: x^2 - 2x = 8. I get -2x(x+4) thank you for your help

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exam Other Question

I am lost on what to do with is the given data. The question is;
Determine the vertex of the parabla: y=(x+2)^2
What is the axis of symmetry?

I know the axis of symmetry is h but how do I find the h?

Thank you for your time Please help me solve this by using the first eight rules of inference to derive the conclusion.
Problem 26.
1. ( P v S) ב ( E ב F)
2. ( P v T) ב (G ב H)