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Find the minimum value of the function \( f(x)=2 x^{2}-6.7 x+2 \) to the nearest hundredth.

Ask by Fowler Page. in the United States
Jan 24,2025

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Answer

The minimum value of the function \( f(x) = 2x^2 - 6.7x + 2 \) is \(-3.61\).

Solution

To find the minimum value of the quadratic function \( f(x) = 2x^2 - 6.7x + 2 \), we can follow these steps: 1. **Determine the Vertex:** - For a quadratic function of the form \( f(x) = ax^2 + bx + c \), the vertex (which gives the minimum or maximum value) occurs at \( x = -\frac{b}{2a} \). - Here, \( a = 2 \) and \( b = -6.7 \). \[ x = -\frac{-6.7}{2 \times 2} = \frac{6.7}{4} = 1.675 \] 2. **Calculate the Function Value at the Vertex:** - Substitute \( x = 1.675 \) into the function: \[ f(1.675) = 2(1.675)^2 - 6.7(1.675) + 2 \] - First, calculate \( (1.675)^2 \): \[ 1.675^2 = 2.805625 \] - Multiply by 2: \[ 2 \times 2.805625 = 5.61125 \] - Calculate \( -6.7 \times 1.675 \): \[ -6.7 \times 1.675 = -11.2225 \] - Add the constants: \[ 5.61125 - 11.2225 + 2 = -3.61125 \] 3. **Round to the Nearest Hundredth:** \[ -3.61125 \approx -3.61 \] **Minimum Value:** \(-3.61\)

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To find the minimum value of the quadratic function \( f(x)=2 x^{2}-6.7 x+2 \), we can use the vertex formula for a parabola given by \( f(x) = ax^2 + bx + c \), where the x-coordinate of the vertex (which gives us the minimum for \( a > 0 \)) is found using \( x = -\frac{b}{2a} \). Here, \( a = 2 \) and \( b = -6.7 \). Thus, \[ x = -\frac{-6.7}{2 \cdot 2} = \frac{6.7}{4} = 1.675 \] Next, we will find the corresponding minimum value of \( f \) by substituting \( x = 1.675 \) back into the function: \[ f(1.675) = 2(1.675)^2 - 6.7(1.675) + 2 \] Calculating \( (1.675)^2 \): \[ (1.675)^2 \approx 2.803625 \] Now we can substitute this back into the function: \[ f(1.675) = 2(2.803625) - 6.7(1.675) + 2 \] \[ = 5.60725 - 11.2225 + 2 \] \[ = 5.60725 - 11.2225 + 2 \approx 5.60725 - 11.2225 + 2 \approx -3.61525 \] Now rounding to the nearest hundredth: \[ -3.61525 \approx -3.62 \] Therefore, the minimum value of the function \( f(x) \) to the nearest hundredth is \[ \boxed{-3.62} \]

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