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f(x)=ax^(2)+bx+c, agt0 The coordinates...

`f(x)=ax^(2)+bx+c, agt0`
The coordinates of the lowest point on the graph of the function defined by the equation above is `(3, 2)`. If `f(-1)=p`, then which of the following represents the value of p?

A

`f(-5)`

B

`f(-4)`

C

`f(6)`

D

`f(7)`

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The correct Answer is:
To solve the problem, we need to find the value of \( p \) where \( p = f(-1) \) for the quadratic function \( f(x) = ax^2 + bx + c \) with the vertex (lowest point) at the coordinates \( (3, 2) \). ### Step-by-Step Solution: 1. **Identify the vertex form of the quadratic function**: Since the vertex of the parabola is given as \( (3, 2) \), we can express the function in vertex form: \[ f(x) = a(x - 3)^2 + 2 \] Here, \( a > 0 \) ensures that the parabola opens upwards. 2. **Calculate \( f(-1) \)**: We need to find \( f(-1) \): \[ f(-1) = a(-1 - 3)^2 + 2 \] Simplifying this: \[ f(-1) = a(-4)^2 + 2 = 16a + 2 \] 3. **Use symmetry of the parabola**: The vertex \( (3, 2) \) implies that the parabola is symmetric about the line \( x = 3 \). Therefore, the point \( (-1, f(-1)) \) is symmetric to the point \( (7, f(7)) \) across the line \( x = 3 \). Thus, we have: \[ f(-1) = f(7) \] 4. **Calculate \( f(7) \)**: Now, we can also find \( f(7) \): \[ f(7) = a(7 - 3)^2 + 2 \] Simplifying this: \[ f(7) = a(4)^2 + 2 = 16a + 2 \] 5. **Conclusion**: Since \( f(-1) = f(7) \), we have: \[ p = f(-1) = 16a + 2 \] ### Final Answer: The value of \( p \) can be represented as: \[ p = 16a + 2 \]
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