4.9 QUADRATIC INEQUALITIESSolve Algebraically

SOLVE ALGEBRAICALLY2 11 24x x 2 11 24 0x x

8 3 0x x 3, 8x

SOLVE ALGEBRAICALLY27 6 1x x

27 6 1 0x x 7 1 1 0x x

181,x

SOLVE ALGEBRAICALLY23 7 20x x

23 7 20 0x x 3 5 4 0x x

53 , 4x

ROBOTICS

The number T of teams that have participated in a robot-building competition for high school students can be modeled by

where x is the number of years since 1992. For what years was the number of teams greater than 100?

27.51 16.4 35, 0 9T x x x x

ASSIGNMENTp. 305 # 46 - 50, 70 - 73