SOLUTION: Graph the function. y = (x - 3)(x + 4)

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Question 400039: Graph the function.
y = (x - 3)(x + 4)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Using the vertex form of a parabola, y=a%28x-h%29%5E2+%2Bk where(h,k) is the vertex

 y = (x - 3)(x + 4)

 y = x^2 + x - 12  |expanding

 y = (x +1/2)^2 - 1/4 - 12  |completing the square

 y = (x + 1/2)^2 - 49/4   Vertex is Pt(-1/2,-49/4), line of symmetry x = -1/2