Question

the
When expanded
a + 2b - c)2 is equal to
expression​

Answer 1

Answer:

(a + b - c)2 = [a + b + (-c)]2

                  = a2 + b2 + (-c)2 + 2ab + 2 (b) (-c) + 2 (-c) (a)

                  = a2 + b2 + c2 + 2ab – 2bc - 2ca

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