assignment sheet-WA9_MAT-115-mar18.docx - MAT-115...

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MAT-115: INTERMEDIATE ALGEBRA Written Assignment 9 9.1: Solve Quadratic Equations Using the Square Root Property Solve. 1. x 2 = 25 2. x 2 + 25 = 0 3. x 2 = 20 4. 3 x 2 = 27 5. ( x 2 ) 2 = 36 6. ( x + 5 ) 2 =− 49 7. x 2 + 6 x + 9 = 4 8. ( x + 5 ) 2 20 =− 4 9.2: Solve Quadratic Equations by Completing the Square Complete the square to make a perfect square trinomial. 9. x 2 + 14 x 10. x 2 2 x Solve by completing the square. 11. x 2 20 x = 44 12. x 2 2 x = 3 13. x 2 8 x + 12 = 5 Copyright © 2018 by Thomas Edison State University. All rights reserved.
9.3: Solve Quadratic Equations Using the Quadratic Formula Solve by using the quadratic formula. 14. 2 x 2 + 5 x 3 = 0 15. 2 x 2 x 3 = 0 Use the discriminant to predict the number of real solutions. 16. 7 x 2 + 8 x = 0 17. 10 x 2 + x + 9 = 0 18. 9 x 2 + 6 x + 1 = 0 9.6: Graph Quadratic Functions Using Properties Graph. 19. y = x 2 + 4 20. y =( x + 4 ) 2 21. y =( x 4 ) 2 22. y = 4 x 2 Find the axis of symmetry and the vertex of the parabola. 23. f ( x )= x 2 + 10 x + 25 24. f ( x )= x 2 10 x + 25 25. f ( x )= x 2 + 12 x + 36 Find the intercepts of the parabola. Copyright © 2018 by Thomas Edison State University. All rights reserved.
26. f ( x )= x 2 3 x 10 27. f ( x )= 25 x 2 10 x + 1 Graph the parabola by using its properties. 28. f ( x )= x 2 4 x 5 29. f ( x )=− x 2 5 x 6 Solve. 30. A ball is thrown vertically upward from the ground with an initial velocity of 110 ft./sec. Use the