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Plz help i don't understanding

Answer» HIII dear________

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Use this formulla :
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2BC + 2ca

(a+2b+5C)2 = (a)2 + (2b)2 + (5c)2 + 2(a)(2b) + 2(2b)(5c) + 2(5c)(a)

= (a)2 + (2b)2 + (5c)2 + 4AB + 20bc + 10ac


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