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find the parent function of y = (-1/2)(x-1)^2 - 5

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Answered by GPT-4o mini
The given function is

\[ y = \left(-\frac{1}{2}\right)(x-1)^2 - 5. \]

To identify the parent function, we can look at the structure of the function. The expression \((x-1)^2\) suggests that the basic shape of the function is a quadratic function, which is characterized by the general equation

\[ y = x^2. \]

This means that the parent function is:

**Parent Function: \( y = x^2 \)**

The transformations applied to the parent function to obtain the given function are:

1. **Horizontal Shift**: The term \((x-1)\) indicates a shift to the right by 1 unit.
2. **Vertical Stretch/Compression**: The coefficient \(-\frac{1}{2}\) indicates a vertical compression (since the absolute value is less than 1) and a reflection in the x-axis (due to the negative sign).
3. **Vertical Shift**: The \(-5\) indicates a downward shift by 5 units.

Putting all these transformations together gives you the function described:

1. Shift right by 1 unit
2. Reflect across the x-axis
3. Compress vertically by a factor of 2
4. Shift down by 5 units

Thus, the parent function is \( y = x^2 \).

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