1.

Show that :(i) (3x+7)2−84x=(3x−7)2(ii) (4pq+3q)2−(4pq−3q)2=48pq2(iii) (a−b)(a+b)+(b−c)(b+c)+(c−a)(c+a)=0

Answer» Show that :



(i) (3x+7)2−84x=(3x−7)2



(ii) (4pq+3q)2−(4pq−3q)2=48pq2



(iii) (a−b)(a+b)+(b−c)(b+c)+(c−a)(c+a)=0


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