State whether each of the following equations represents a quadratic function or not. ACTIVITY 2: Identify Me!
Justification
Justify your answer.
Equations
Yes or No
1. y = x2 + 3
2. y = 4x - 5
3.y=18 – 34²
4. y = 3* + 3
5. y = 4x2 + x + 4
6. y = 3 + 4x + 2
7. y=34²
8. y = (x - 1)(x + 9)
9. (x-2)(x + 2) + x2 - y = 0
10. 0 = y + 5x3 - 3x

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.