How do you know when to use the Estimation strategy vs the Guess and Check strategy ?

The guessing strategy only works when you don’t u don’t understand a question so I advise you NOT to do it , only when it’s necessary but the Estimation strategy works when you don’t have a any but a answer where theirs decimals or a answer that is close to one another and can be rounded

-the equation is a quadratic

-the axis of symmetry is x=-7

-the graph has a relative maximum