X^2-18x-6. complete the square

(x - 9)² = 87

Step-by-step explanation:

Move the -6 to the other side

x² - 18x = 6

The number you add to each side is (b/2)²

(b/2)² is (-18/2)² = 81

x² - 18x + 81 = 87

(x - 9)² = 87

Step-by-step explanation:

Let "a" represent the number of adult tickets sold. Then the total revenue is ...

  5a +3(200-a) = 720

  2a +600 = 720 . . . . . . simplify

  2a = 120 . . . . . . . . . . . . subtract 600

  a = 60 . . . . . . . . number of adult tickets sold

  200-a = 140 . . . number of tickets for children sold