Answer:
74.958
Step-by-step explanation:
Because 57.66 added 30 percent is equal to 74.958
c = 196
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
D
4 -.-
