exam Maths Puzzle Numerical Ability

How do I express as a polynomial? (x-4)(2x+3)

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exam Other Question

c = 2p r (the p next to the 2 is supposed to be rr type symbol)
Find the circumference of each figure. Use 3.14 for "rr" and round your answer to one decimal place.
There is a solve the equation

log_b(x+2)-log_b(3)=6