Question 1082845: Write an equation of a quadratic function given the vertex and another point on the graph.
Vertex: (–5, –10)
Point: (0, 15)
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source):
Answer by MathTherapy(10551)  (Show Source):
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Write an equation of a quadratic function given the vertex and another point on the graph.
Vertex: (–5, –10)
Point: (0, 15)
Vertex form of a quadratic equation: 
 ------ Substituting (0, 15) for (x, y), and (- 5, - 10) for (h, k)
15 = 25a - 10
15 + 10 = 25a
 ------ Substituting 1 for a, and (- 5, - 10) for (h, k)
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