Question

How Do I exactly Solve This I am quite confused on what my first step should be?

Answer 1

Answer:

The answer is "$\ 280$"

Explanation:

Using formula:

$\to -\frac{b}{2a}$

$= -\frac{(-224)}{(2(0.4))} \\\\= \frac{224}{0.8} \\\\= 280$