50. From a2+2ab+b2 take a2-2ab+b2. 51. From a2+2ab+b2 take a2-b2. 52. From x2-2xy + y2 take x2+2xy+y2. 53. From 23+3x2y+3xy2+y3 take x3+y3. 54. From a2-3ab+11abx-17 take a2-6αbx+71. 61. 60. 11ac + 7abx-6 -9ac-11abx +19c 62. 11ax+7by+12aby-11ay 3acx+7ax+79abx -12ax-8by-12aby+11ay 8acx+8ax+84abx 75. From 872-37cy+8ab subtract 67x+67cy +-18ab. 76. From 67x+69cy +18ab subtract 87x-37cy +8ab. 77. From 64ax-37cy+a2b2 subtract 7ax+a2b2 -84cy. 78. From a -2ab+b2 subtract 6a2-7ab-862 and from the answer take 6a2-7ab+362. 79. From 3a-6a+7y take 64a2+7ax-8y, and from the answer take 11a2+3ax-7y. 80. From 3ax-7by+3a2b2+7axy take 34ax-8axy +-4a2b2+7by, and from the answer take 11by-6a2b3 +7axy-12ax+-7. 81. (a2-b2+c2—3c2) — (8a2+6c2 −2c2+8b2). 15. 23a-7b+12c-35by+4cx+165. 16. 17. 18. 19. 13a2b-3ab+cx. 20. 21. 22. 23. 24. 17a2x-6xy-3xy2+9by—abx+88. 20x2y-4bxy+12ax-95cx+81c+5cy. 42-2ca2+5y. -8cx-161ab +7. 135abx-95ab+4ax-14. -2-2c+4d-e+f. -11c-8x+15cx-9ax. 61ax-24bx-cx-11. 34 71. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. -20x y2+10y2+85a2b2-66. 105a-x-762y+72xy. ―20x+106cy+10ab. 57ax +47cy. -11a2+12ab+6b2. -72a-10ax+22y. -19ax-25by+5ab2+8axy-7. -7a2-9b2+6c2. MISCELLANEOUS EXERCISES. When x = : 1, y = 3, z = = 4, a = = 5. |