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.

9-7 Linear, Quadratic & Exponential Models Algebra 1

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

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

Exponential Functions first and second differences aren’t the same

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).

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) 2b) x y -1 8 4 2 1 3 0.5 x y 1 2 8 3 18 4 32

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

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