Question

find the value of a²+b²+c²-2abc +a+b-c
if a=1,b=2,C=-1​

Answer 1

Answer:

6

Step-by-step explanation:

a=1

b=2

c=1.

= 1 + 4 + 1 - 2 × 1 ×2 × 1 + 1 + 2 + 1

= 6 - 4 + 4

= 6 - 0

= 6

Answer 2

Answer:

tell if it's correct

Step-by-step explanation:

I am not sure so I done it again in the 2nd pic.