Book Maths Puzzle Algebra

Can you help me with dividing polynomials? Here's the equation:



2x^3 - 3x^2 + 4x - 21 / 2x + 1

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Book Other Question

KX^2+x+25k

solve the equation for k=?
the solutions has repeating solution(two)
How do I do the below problem?

(.04-.0008t)(50-t)=.5