exam Maths Puzzle Numerical Ability

I need help! Please show how to solve this problem. Thank you.

The demand and supply equations for a certain item are given by
D = -5p + 40
S = -p^2 + 30p - 8
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exam Other Question

what are the possible values of x in x(x)=225 using the method called extracting square roots?please show me the soution... how do I factor this polynomial? Thank you for your help :)

64x to the second -81.