Question Number 25 by user1 last updated on 25/Jan/15
$$\mathrm{Expand}\:\:\left(\mathrm{a}+\mathrm{b}+\mathrm{c}\right)^{\mathrm{2}} \\ $$
Answered by user1 last updated on 31/Oct/14
$$\:\left({a}+{b}+{c}\right)\left({a}+{b}+{c}\right) \\ $$$$={a}^{\mathrm{2}} +{b}^{\mathrm{2}} +{c}^{\mathrm{2}} +\mathrm{2}{ab}+\mathrm{2}{bc}+\mathrm{2}{ca} \\ $$