exam Maths Puzzle Numerical Ability

Can someone please help solve this problem.

(8x^3-20x^2-48x-18)/(4x+2)

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exam Other Question

I have a word problem that I don't know how to solve.

An art dealer sold two artworks for $1520 thereby making a profit of 25% on the first work and 10% profit on the other, whe In triangle PQR, QS is perpendicular to PR, PQ is congruent to RQ, angle 1 equals 4x, angle 2 equals 2x+18 a.prove triangle PQS is congruent to traingle RQS
b.Find the value of x