How do you do this?

Question

The demand and supply equations for a certain item are given by
D = –5p + 40
S = –p^2 + 30p – 8
Find the equilibrium price

Answer 1

-5p + 40 = -p² + 30p - 8
p² - 35p + 48 = 0

Apply quadratic formula for your answer.

x = 1.43, 33.6