Question

What number must you add to complete the square?x + 28x = 11

Answer 1

In a equation expressed by the form a*x^2 + b*x = c, we can complete square adding (b/2a)^2 on both sides.

For x^2 + 28x = 11, we have a = 1 and b =28

Therefore, we add (28/2*1)^2 = 14^2 = 196 on both sides.