Question

if a^2+b^2+c^2 = 2(a-b-c)-3, then (a-b+c)=?
a) -1
b) 3
c) 1
d) -2

Answer 1

actually given expression is a sum of three squares

Answer 2

ok\[a^2+b^2+c^2 = 2(a-b-c)-3\]\[a^2+b^2+c^2-2a+2b+2c+1+1+1=\]\[\]

Answer 3

(a-1)^2+(b+1)^2+(c+1)^2=0

Answer 4

so a=1, b=-1, c=-1

Answer 5

so 1-b+c=1

Answer 6

a-b+c=1