exam Maths Puzzle Numerical Ability

i need to solve by factoring
x^2-9x-4=6

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exam Other Question

Write as a single logorithm:
(1/2)ln(x^2+1)-4ln(1/2)-(1/2)[ln(x-4)+ln x] can you please help me solve this:Ax+By=-28 contains the points (-8,4)(-11,9)