Question

If a = 10, b = 30 and c = 20, find the value of - ab + bc- ac​

Answer 1

Answer:

b+c=20;

b=20-c;

a+b = 10= a + 20-c;

c = a+ 20–10= a+ 10;

c+a= 24= a+10+a= 2a+ 10;

2a= 24–10=14 ;

a=7;

a+ b= 10= 7 + b;

b= 10–7=3

c= 17