26. x - 3x2 + x - 3
25. ab? +(a -1b-1
28. r?-Xa +2b) + 2ab
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Answer:
(iv) l-4x + 10x!i-12xz + 9x4'. (v) x6+2a;5 + 3x4+4a;3 + 3x2 + 2a; + l. 26. (i) a3 + 63 + c3 ... 25. cs2 + as-c. 26. 2as - (36 - 4c) y. 27. a2 -3a6 + 62. 28. x2-xy+y\. (x + y)2 -z(x + y) + z2. ... (o-c) 2 +(c-a) 2 + (a-6) 2 ... ~2ab ' 2a& ' .
Explanation:
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