Question

ii) Write expansion of (a + b +c)?​

Answer 1

Answer:

a + b + c is the expansion only .

Answer 2

Step-by-step explanation:

(a + b + c)2 = {a + (b + c)}2 = a2 + 2a(b + c) + (b + c)2.

= a2 + 2ab + 2ac + b2 + 2bc + c2.

= a2 + b2 + c2 + 2(ab + bc + ca)

Therefore, (a – b + c)2 = a2 + b2 + c2 + 2(ac – ab – bc)

Similarly for (a – b – c)2, etc.