1. 1.) What is the value of the discriminant?
Bellwork
4x²+7x -15 = 0
1.) What is the value of the discriminant?
2.) How many real # solutions are there?
3.) Solve the equation using the quadratic formula.

2. 9-7 Linear, Quadratic & Exponential Models
Algebra 1

3. Linear y = mx + b (has same differences for y)

4. Quadratic y = a 𝑥 2 +𝑏𝑥+𝑐 second differences are the same (y value)

5. Exponential Functions first and second differences aren’t the same

6. Ex. 1 Graph each set of points
Ex. 1 Graph each set of points. Which model is most appropriate for each set?
Ex. 1a) (0, 0), (1,1), (-2, -2), (2,2)
Ex. 1b) (-2, 10), (-1, 5), (0,3), (1,5)
Ex. 1c) (-1, 0.5), (0, 1), (1, 2), (2, 4), and (3, 8).

7. Ex. 2 Which type of function best models the data in the table
Ex. 2 Which type of function best models the data in the table? Write an equation to model the data. 2a) b) x y -1 8 4 2 1 3
0.5 x y 1 2 8 3 18 4 32

8. Ex. 3 Which type of function best models the data in the table
Ex. 3 Which type of function best models the data in the table? Write an equation to model the data. x y
539.02 1
556.20 2
573.38 3
590.56 4
607.74

9. Ex. 2) Which type of function best models the data?
Ex. 2a) (-1, 0.5), (0, 1), (1, 2), (2, 4), and (3, 8).