Answer: 7892
explanation: add each number individually left to right. 4+3 , 2+6 , 9+0 , 0+2
B. triangle ABC is isosceles. The angles add up 180 degrees.
Answer: The correct option is (c) 
Step-by-step explanation: We are given to solve the following quadratic equation by the method of completing the square:

Also, we are to find the constant added on both sides to form the perfect square trinomial.
We have from equation (i) that

So,

Thus, the required solution is
and the value of the constant added is 
Option (c) is correct.