ADD: (iii) a? - b? + ab, b2 - c2 + bc and c? – a² + ca
(iv) 2a² + 362, 5a? – 2b2 + ab and - 6a? – 5ab + b2
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Answer:
(3)
- (a²-b²+ab)+(b²-c²+bc)+(c²-a²+ca)
- a²-a²-b²+b²+c²-c²+ab+bc+ca
- ab+bc+ca
(4)
- 2a²+362+5a²-2b²+ab +(-6a²-5ab+b²
- 2a²+5a²-6a²-2b²+b²+ab-5ab+362
- 7a²-6a²-b²-4ab
- a²-b²-4ab+362
- (a-b)²-6ab+362
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