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67. 3a + 2ab + b2+ 3ay 7a-4ab +362-llay

68. 37ay +4abx + 7axy gay

+81axy

69.

31a + 2ax- 7xy + 8

-9ax +182y +21

70.
34axy + 74xy + 7
96axy

+34

71.

72. 74.%y-31y' + 7a2b2 +18 31a222 - by +34xy 94x2y3 – 4lya — 78a%b2 +84 – 74a2v2 +67%ya — 38xy

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75. From 87x - 37cy + 8ab subtract 67x+67cy +18ab.

76. From 672 +69cy +18ab subtract 872—37cy +8ab.

77. From 64ax— 37cy + a2b2 subtract Tax +a?l? -84cy.

78. From a? - 2ab + b2 subtract 6a-7ab-86%, and from the answer take 6a-7ab +362.

79. From 3a-6ax + 7y take 64a2 + 7ax-8y, and from the answer take lla? + 3ax-7y.

80. From 3ax-7by + 3a2b2 + 7axy take 34ax-8axy +-4a2b2 + 7by, and from the answer take 1lby-6a279 +7axy-12ax+7.

81. (a2—62 +62—3cm) – (8a+6c2—20+86%).

ANSWERS TO ADDITIONAL EXERCISES.

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-2a2-56% +2c-50%.
9.cy-7by +2cx.
15cæ +6by-12c.
896c-7cy +5ax.
ab + 4cx-8ab.
156-70-F7a.
- 4ac-8by+2c.0.
98ab - 740 +85d.
- ab-llab:+4cy.
- 3ab-7cx-11.
155ab +6cy-322.
12ab +7cy-12ab%.
- 7ax +4by +4cx.
15ab + 15cy-27.
23a-76+

12c-35by + 4cx+165.
17aRx-6xy-3xy? + 9by-abx+88.
20.%y-4bxy+12ax-95cx+81c +5cy.
4x2 — 2ca2 + 5y.
13a2b 3ab+c%.
-8c2 - 16lab +7.
135ab. — 95ab +4ax-14.
--2-2c +4d-e+f.
-11c-8x +15cx— 9ax.
6lax-2463-cx - 11.
16cx—126bx+8xy.
5.-15by +4ca.

-9-3.0 + 4ax +32acy.
168a% +66%a.
9322—966ax-8abx-c2.
a++%-de-f%.
84a2-9462.-4c2c +81.
15862-50c-91.c%.
70% +2%-8d2-9.
-5F6% +26%+91ax +12awy.

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28ab + ac ax.
—20xy +22xz.
-70ab + 6xy-25+ 6e.
94aba-7cy-84c2 +84b..
14abc-15acx-10.
26abx-15abc + 7ax - 11.
178ab-15xy +87*.
118ax—158cx— 242.
-41+7ab tax-9cx.
176aba +63ax +92.
26axy +42ay-ac-ax.

- 1270-176-200ac -33.
- 38aca +16abæ- 18aby +12acy-286.
28ab + 9.2-13by.
-4ab.
4ab.
2ab + 26%
-4cy.
3y + 3xy?
17abx-88-3ab.

-6x2 - 4xy +13ab + 14ac.
70c +16bc-19abc + 35.
22—112y2 + 2aby +15.
25ay - 49by +35cy +a.
7aby- 5acy«»llaxy-7.
20ac + 18abx-6-19c.
23ax +15by +24aly-22ay.
- 5@cx - ax --- 5ab..
-6aby +15ab:- 15ax +175.
-6acæ +702-16y-10.
20ax + 6by-15ca-12.
10ax +76ay+15dy.
- 4a +6ab-262 + 14ay.
28ay +4abx— 74axy.
31a3 + llax—25xy – 13.
-62axy +74ry-27.

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MISCELLANEOUS EXERCISES.

When x = 1, y = 3,%= 4, a= 5. Find the value of 1. 32-74 +8z-6a

Ans. - .

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