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.

45.

46.

47.

48.

26axy +42ay-ac ax.

-127a-17b-200ac-33.

-38acx+16ab2-18aby+12acy-286.

28ab+92-13by.

34

71.

72.

73.

74.

75.

76.

77.

78.

79.

80.

81.

-20x y2+10y2+85a2b2-66.

105a-x-762y+72xy.
151ax+1096y2+988xy.
―10ay+30by―50cy.
20x-104cy-10ab.

―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.