Question

(b) (a – 2b – 3c)2 + (2a + 3b - c)2 + (3a – b + 2c)2
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Answer 1

Answer:

We know that,

(a+b+c)² = a² +b²+ c² + 2ab +2bc+2ca

= (a²+4b²+9c²- 4ab + 12bc- 6ca )+(4a²+9b² +c² +12ab- 6bc- 4ca) + (9a²+ b²+4c²- 6ab - 4bc + 12ca)

= 14a² + 14b² + 14c² + 2 (ab + bc + ca)

hope it helps you....

Answer 2

Step-by-step explanation:

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