Question

Find the value of a2+b2+c2-ab-bc-ca. When a-b=2, b-c=3, and c-a=4.

Answer 1

Step-by-step explanation:

a*2+b*2-ab-bc-ca+c*2

(a-b)*2+ab-bc-ca+c*2

4-b(c-a)+c(c-a)

4-(c-a)(b-c)

4-(4)(3)

4-12

-8