Question

plz help i don't understanding

Answer 1

hiii dear________

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here's your answer__________________

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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

Answer 2

hey here is your answer
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Use the formula
${(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2ab + 2bc + 2ac \\ \\ \\ {(a + 2b + 5c)}^{2} \\ = {a}^{2} + {(2b)}^{2} + {(5c)}^{2} + 2(a)(2b) + 2(2b)(5c) + 2(a)(5c) \\ = {a}^{2} + {4b}^{2} + {25c}^{2} + 4ab + 20bc + 10ac$
hope helps
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