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2. The number of volleyball games that must be, leaque cwith n Eeams is given by, where each Eeam plays cwith every, Scheduled in a, Gcn), %3D, 2., other team excactly once. A league schedules 15 games,, How many re beoms are in the league?, Soln:, G (n) = n-ņ =15, -30, n²-n =(15)(2), = 80, n²n-30, (n-6) (n +5), n-6 =0, n +5=0, n= 6, n = -5 (not poassible)., :. No. of teams, Completing the Square method., Example: 3:30;, Soln:, x-3x -230, x²-3x, Solve x- 3x -2=0, = 2, =2+, 8+9 - 17, 4, 17, and, 3-V17, 2., 2., Example : 3:3|:- Solve 2x²-sx-1=0, dolp, 2x-x-1 = 0, 2x- x, X[d