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Describe how the given function can be obtained from one of the basic graphs. Then graph the function. \( g(x)=(x+1)^{2}-2 \)

Ask by Burns Washington. in the United States
Mar 18,2025

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To graph the function \( g(x) = (x+1)^2 - 2 \), start with the basic parabola \( f(x) = x^2 \). Shift it left by 1 unit and down by 2 units. The vertex is at \((-1, -2)\), and the parabola opens upward. Plot the vertex and key points like \((0, -1)\) and \((-2, -1)\), then sketch the symmetric parabola.

Solución

1. **Identify the Basic Graph** The given function is \[ g(x) = (x+1)^2 - 2. \] Recognize that the basic function here is \[ f(x) = x^2, \] which is the standard parabola. 2. **Determine the Transformations** - **Horizontal Translation:** The term \((x+1)^2\) indicates a shift of the basic graph \(f(x) = x^2\) to the left by 1 unit. - **Vertical Translation:** The subtraction of 2, \(-2\), indicates a downward shift of the entire graph by 2 units. 3. **Locate the Vertex** For the function \(g(x) = (x+1)^2 - 2\), the vertex of the parabola is obtained by taking the translation into account. - The vertex of \(f(x)=x^2\) is \((0,0)\). - After shifting left by 1 and down by 2, the vertex becomes \[ (-1, -2). \] 4. **Graph the Function** - **Shape:** The graph is a parabola that opens upward because the coefficient of the squared term is positive. - **Vertex:** The vertex is at \((-1, -2)\), which is the lowest point on the graph. - **Axis of Symmetry:** The vertical line \(x = -1\) is the axis of symmetry. - **Key Points:** - When \(x = 0\): \[ g(0) = (0+1)^2 - 2 = 1 - 2 = -1, \] so the point \((0, -1)\) lies on the graph. - When \(x = -2\): \[ g(-2) = (-2+1)^2 - 2 = (-1)^2 - 2 = 1 - 2 = -1, \] so the point \((-2, -1)\) is also on the graph. - These points confirm the symmetry about the line \(x = -1\). 5. **Conclusion: Transformation Process** The function \(g(x) = (x+1)^2 - 2\) is obtained from the basic quadratic function \(f(x) = x^2\) by: - Shifting the graph to the left by 1 unit - Shifting the resulting graph downward by 2 units 6. **Sketching the Graph** To sketch the graph: - Plot the vertex at \((-1, -2)\). - Draw the axis of symmetry along the line \(x = -1\). - Plot the points \((0, -1)\) and \((-2, -1)\) to show symmetry. - Sketch the parabola opening upward, passing through these points. The final graph is a parabola with vertex at \((-1, -2)\), opening upward, and symmetric about the line \(x = -1\).

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Beyond the Answer

To understand how the function \( g(x) = (x+1)^{2} - 2 \) is obtained, we start with the basic graph of the parent function \( f(x) = x^2 \), which is a standard upward-opening parabola with its vertex at the origin (0, 0). The transformation involves shifting this graph to the left by 1 unit (due to the \( (x + 1) \)) and then moving it downward by 2 units (thanks to the -2), resulting in the vertex of the new function \( g(x) \) being at the point (-1, -2). When graphing \( g(x) \), you'll begin by sketching the original parabola \( x^2 \). Next, apply the transformations: shift every point on the parabola leftward by 1 unit, and then down by 2 units. The resulting graph will be an upward-opening parabola centered at (-1, -2), looking just like a comfy downward-moving roller coaster at its lowest point, ready to take you on an exhilarating ride!

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