Which graph represents the function f(x) = (x – 3)2?

On a coordinate plane, a parabola opens up. It goes through (negative 6, 8), has a vertex at (negative 3, 0), and goes through (negative 0, 8).

On a coordinate plane, a parabola opens up. It goes through (negative 4, 7), has a vertex at (0, negative 9), and goes through (4, 7).

On a coordinate plane, a parabola opens up. It goes through (1, 4), has a vertex at (3, 0), and goes through (5, 4).

On a coordinate plane, a parabola opens up. It goes through (negative 2, 7), has a vertex at (0, 3), and goes through (2, 7).

1 answer

To determine which graph represents the function \( f(x) = (x - 3)^2 \), we start by analyzing the characteristics of this quadratic function.

  1. Vertex: The vertex of the function \( f(x) = (x - 3)^2 \) is at the point \( (3, 0) \).

  2. Direction: The parabola opens upwards since the coefficient of the squared term is positive.

  3. Intercepts: The y-intercept can be found by substituting \( x = 0 \): \[ f(0) = (0 - 3)^2 = 9 \text{.} \] So the function passes through the point \( (0, 9) \).

  4. Symmetry: The parabola is symmetric around the vertical line \( x = 3 \).

Now, we can evaluate the given options based on these characteristics:

  • First graph: Vertex at \((-3, 0)\), doesn’t match.
  • Second graph: Vertex at \((0, -9)\), doesn’t match.
  • Third graph: Vertex at \((3, 0)\) and passes through points \( (1, 4) \) and \( (5, 4) \), seems like it could match.
  • Fourth graph: Vertex at \((0, 3)\), doesn’t match.

Now, let's verify the points for the third graph:

  • The vertex is \((3, 0)\), which is correct.
  • To see if it goes through \((1, 4)\): \[ f(1) = (1 - 3)^2 = (-2)^2 = 4 \text{, which is correct.} \]
  • The point \((5, 4)\): \[ f(5) = (5 - 3)^2 = (2)^2 = 4 \text{, which is also correct.} \]

Since the third graph correctly fits all criteria:

The correct graph representing the function \( f(x) = (x - 3)^2 \) is the third graph, which has the vertex at \( (3, 0) \) and passes through \( (1, 4) \) and \( (5, 4) \).

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