Consider the equation y\:=\:-x^2\:-\:7x\:+\:12. Determine whether the function has a maximum or a minimum value. State the maximum or minimum value. What are the domain and range of the function?

Step-by-step explanation:

To answer this we need only know that negative parabolas are upside down, so by definition, it has a max point at the vertex. To find the vertex (h, k), the easy way to do this is to fill in the following expressions for h and k and solve:

 and   (These are derived from the quadratic formula). Filling in knowing our a = -1, b = -7, c = 12:

 and

so the vertex (aka max height occurs at . Depending upon what is meant by stating the max value, we may only need to state the k value (which is the same as the y coordinate, which is an up or down thing as opposed to the x value which is a side to side thing). The domain is all real numbers, as is the case for all x-squared parabolas, and the range is

R = {y | y ≤ 97/4}

I can't see your choices so match them up from these answers to the ones in the list of choices.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7