To find the range of the quadratic function \( y = x^2 - 4x + 4 \), we can start by rearranging it into vertex form by completing the square.
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The given quadratic can be rewritten as: \[ y = x^2 - 4x + 4 \]
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We notice that the expression \( x^2 - 4x + 4 \) can be factored: \[ y = (x - 2)^2 \]
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The expression \( (x - 2)^2 \) reaches its minimum value when \( x - 2 = 0 \), or \( x = 2 \). At this point: \[ y = (2 - 2)^2 = 0 \]
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Since the squared term \( (x - 2)^2 \) is always non-negative (i.e., \( (x - 2)^2 \geq 0 \) for all \( x \)), the minimum value of \( y \) is \( 0 \).
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Therefore, the range of the function is all values of \( y \) such that \( y \) is greater than or equal to \( 0 \).
Given this analysis, the range of the quadratic function \( y = x^2 - 4x + 4 \) is: \[ \text{Range: } [0, \infty) \]