Question

If a = 2, b=-2 and c = 1, then find the
values of the following expressions.
a
b
+
b
c
+
с
а​

Answer 1

Answer:

ab+bc+ca

= 2× -2 +( -2) × 1 + 1 × 2

= -4 + (-2) + 2

= -4 -2 +2

= -6 +2

= -4 ..

Answer 2

Answer:

ab+bc+ca

=2×-2+-2×1+1×2

=-4+-2+2

=-4