Answer:
ou can deduce what should (a+b+c)2 be using same reasoning..
(a+b+c)2=a2+ab+ac+ab+b2+bc+ac+bc+c2
=a2+b2+c2+2ab+2bc+2ca
Now the question is what is (a+b+c+d)2=?
Do I need to tell you ? Or you can figure it out ?
(a+b+c+d)2
Step-by-step explanation:
oops i put it all in the answer but heres your answer
