University:
Missouri State University
Course:
MTH 103 | Intermediate Algebra
Academic year:

2021
Views:

348

Pages:

2
Author:

Carla Barrera

Algebra 1 Name: _________________________________ Unit 11: PQ2 Date: _________________ Period: ________ “PRACTICE” QUIZ 2… The Quadratic Formula and the Discriminant Part 1: Use the quadratic formula to solve each quadratic function. No decimal answers. ___________________ 1) x2  2x  3  0 ___________________ 2) x2  6x  2  0 ___________________ 3) 3z 2  5 z  2  0 ___________________ 4) 2 y2  9 y  3  0 ___________________ 5) 5x 2  5  0 ___________________ 6) 3y2  2 y  3  0 ___________________ 7) k 2  9k  10 ___________________ 8) 8 x 2  17 x  2  0 Part 2: Find the discriminant of each quadratic function. ___________________ 9) r 2  5r  2  0 ___________________ 10) 9n 2  3n  2  0 ___________________ 11) 9x2  6x  1  0 ___________________ 12)  2x2  x  1  0 Part 3: Given the discriminant of a quadratic, tell if it has two solutions, one solution, or no real solution. ___________________ 13) Discriminant = 0 ___________________ 14) Discriminant =  76 ___________________ 15) Discriminant = 96 Part 4: Multiple-Choice. Choose the best answer. ___________________ 16) Find the vertex of the graph of the function y  4 x  5 x  1 . 2 5 5 ,4  8 8 B)   5 11  ,3   8 16  11   5 , 5  16   8 D)   A)  C)   ___________________ 17) 9  5 ,   16   8 Which function has the graph shown to the right? A) y  2 x  8 x  3 2 B) y   C) y  1 2 x  2x  3 2 1 2 x  2x  3 2 D) y  2 x  8 x  3 2 ___________________ 18) 2 The equation 2 x  4 x  5  0 has _________________ root(s). A) One ___________________ 19) C) Three D) No Real 2 Find the discriminant of the function x  5 x  0 A) 25 ___________________ 20) B) Two B) 21 C) 1 D) 29 2 Solve the quadratic function 3x  5 x  8 using the quadratic formula. 8  3  8  C) 1 ,   3  A)  1 ,   8   3   8 D) 1 ,   3 B)  1 ,