Question

Find the value of a² + b2 + c - ab-bc-
ca, if a = 2b = - 2 and c = 1.
(A) 7
(C) 13
(D) 1
(E) None of these
(B) 12
​

Answer 1

Answer:

(A) 7

Step-by-step explanation:

this is the answer for the given question

a=-2

b=-1

c= 1

Answer 2

Answer:

option c ie 13 is the correct answer

Step-by-step explanation:

a=2

b=-2

c=1

a^2= 2x2=.. 4

b^2= -2x-2=.4

c=1

-ab= -(2x-2)= -(-4) = 4

-bc= -(-2x1) = 2

-ca= -(1x2) =. -2

now adding all we'll get

4+4+1+4+2-2 = 13

I HOPE THIS WILL BE HELPFUL FOR U ❤️