Find the y-intercept of a quadratic function.
\( \text{Find the y-intercept of the quadratic function } y = x^2 - 4x + 4. \)
Choose one option:
Plug in x = 0 and calculate y.
Substitute \(x = 0\) into \(y = ax^2 + bx + c\) to find the y-intercept.
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