What is the axis of symmetry for f(x) = −5x2 − 20x − 10

For this case we have the following function:
 
 To find the axis of symmetry, the first thing to do is to derive the function.
 We have then:
 
 Equaling zero we have:
 
 We clear the value of x.
 We have then:
 
 
 The axis of symmetry is given by:
 x = -2

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.