Break-even values are the values of x where cost equals revenue. We can use the quadratic formula to find them. Example: The revenue and cost functions are: R(x)= x(50-x), C(x) = 336 + 10x The break-even values are the solutions to R(x) = P(x) = R(x) - C(x) = 0, where P(x) is the profit earned by producing and selling x units. T C(x), or - C(x) R(x) = 336 + 10x -x(50-x) =_ a = 1, b = -40, c = 336 and so b - 4ac = 256 = 16. Find the break-even values of x: