Question

-(a+6b+5c)^2 expand using identies​

Answer 1

= -(a+6b+5c)²

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

= -(a²+(6b)²+(5c)²+2(a)(6b)+2(6b)(5c)+2(5c)(a))

= -(a²+36b²+25c²+12ab+60bc+10ca)

= -a²-36b²-25c²-12ab-60bc-10ca

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