Complete the square

Question

Complete the square fill in the number that makes the polynomial a perfect square quadratic

y^2+28y+__?

Answer 1

For polynomial y^2 + ay + ? - to complete square take 1/2 of a and square it.

For your problem you would take one-half of 28 (14) and square it (196), so that the resulting polynomial is

y^2 + 28y + 196