Question
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$(a+2 b+5 c)^2$
$(a+2 b+5 c)^2$
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Answer
$(a+2 b+5 c)^2$
$=(a)^2+(2 b)^2+(5 c)^2+2(a)+2(2 b)(5 c)+2(5 c)(a)$
$=a^2+4 b^2+25 c^2+4 a b+20 b c+10 a c$
$=(a)^2+(2 b)^2+(5 c)^2+2(a)+2(2 b)(5 c)+2(5 c)(a)$
$=a^2+4 b^2+25 c^2+4 a b+20 b c+10 a c$
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