exam Maths Puzzle Numerical Ability

Use the square root property to solve the following equations

(x - 2)^2 = 25

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exam Other 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. Could you explain to me how to construct the equation of a parabola that has x-axis intercepts at (-2,0) and (4,0) ?