SOLUTION: The vertex of this parabola is at (-3, -1). When the y-value is 0, the x-value is 4. What is the coefficient of the squared term in the parabola's equation?

Question 757598: The vertex of this parabola is at (-3, -1). When the y-value is 0, the x-value is 4. What is the coefficient of the squared term in the parabola's equation?
Answer by pmatei(79) (Show Source): You can put this solution on YOUR website!
The quadratic function can be written as

where (h,k) is the given vertex, and a is the coefficient of the squared term. Thus you can write:

If you expand:

Replace the y with 0 and x with 4:

Solve for a:

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