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 2+3x2y+3xy2+y3 take a3+y3.

54. From a2-3ab+11abx-17 take a2—6abx+71.

61.

60.

11ac + 7abx-6 -9ac-11abx

+19c

62.

11ax+7by+12aby-11ay 3acx+7x+79abx -12ax-8by-12aby+11ay 8acx+8ax+84abx

75. From 872-37cy +8ab subtract 67x+67cy +18ab.

76. From 672 +69cy+18ab subtract 87x-37cy +8ab.

77. From 64ax-37cy+a2b2 subtract 7ax+a22 -84cy.

78. From a2-2ab+b2 subtract 6a2-7ab-862, and from the answer take 6a2-7ab+362.

79. From 3a2-6ax+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 —202+8b3),

16.

17.

18.

19.

20.

21.

22.

23.

24.

17a2x-6xy-3xy2+9by-abx+88. 20x2y-4bxy+12ax-95cx+81c+5cy.

4x2-2cx2+5y.
13a2b-3ab+cx.

8cx-161ab+7.
135abx-95ab+4ax-14.
-2-2c+4d-e+f.

-11c-8x+15cx-9ax.

61ax-24bx-cx-11.

43.

44.

45..

46.

47.

48.

49.

-41+7ab+ax-9cx.

176abx+63αx+92.

26axy +42ay-ac-
- ax.
-127a-17b-200ac-33.

-38acx+16abx-18aby+12acy-286.

28ab+9x2-13by.

-4ab.

MISCELLANEOUS EXERCISES.

When = 1, y = 3, z = 4, a = 5.