Answer:
c = 196
Step-by-step explanation:
28 /2 = 14
14 x 14 = 196
formula =( b/2) x 2
To obtain a perfect square trinomial
Add ( half the coefficient of the x- term )² to x² + 28x
x² + 2(14)x + (14)², that is
x² + 28x + 196
= (x + 14)² ← a perfect square
Here is what I did
