PLZ HELPPP
Break even occurs when the profit is zero; so set P = 0:
0 = -45(x - 9)2 + 1125
-1125 = -45(x - 9)2
25 = (x - 9)2
Either: - 5 = x - 9 or 5 = x - 9
4 = x or 14 = x
Now, you need to choose the correct answer.