Question

If a-b=3 and b-c =5 then the value of a2 + b2 + c2 -ab -bc -ca is

Answer 1

a-b= 3,so b=a-3;
now putting the value of b in equation b-c=5;
so,now. a-3-c=5 ;
by this way we will get an equation;
a-c=8;


so finally answer will be 49