MAT 209 Final Exam Answers Demo content and sample answers Perform the indicated operation: 1. 19×2 - 13x + 31 - 12×2 - 24x - (16×2 - 27x + 25) 2. 7xy2(5×3 – 4x2y2 + 3xy4) 3. (13x + 5)(9x - 13) - - - 4. (25x - 12)2 - - 5. (13a + 15b)(13a - 15b) - - 6. (25×4 - 35×3 + 45×2) / (5×2) - - - 7. (9.63 x 1035)(8.56 x 10-26) answer in scientific notation - - - 8. 2x / (x + 5) – 150 / (x2 - 25) + 3x / (x – 5) - - - - - - - 9. x / (x - y) – y / (x + y) - - - - 10. 5 / [sqrt(5) + sqrt(7)] – 7 / [sqrt(5) – sqrt(7)] - sqrt(7)][ sqrt(5) + sqrt(7)] - - - - Solve the equations for x. 11. (2x – 3)2 - 2x-3- 2x- x- 12. 125×2 - x2- x- x- 13. 8×2 + 6x - 5 - (2x-1)(4x+5)- 2x-1- x- 14. 5×2 – 4x – 3 - X- X- 15. 24×2 + 32x - 96 - 3×2 + 4x – 12- X- X- 16. 4.56×2 + 7.89x – 7.65 - X- - - X- 1