Question
Show that $$(a+b+c+d)^{2}=a^{2}+b^{2}+c^{2}+ d^{2}+2 a b+2 a c+2 a d+2 b c+2 b d+2 c d$$.
Step 1
Step 1: We start with the left hand side of the equation which is $(a+b+c+d)^{2}$. Show more…
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