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Complete the square of the given quadratic expression. Then, graph the function using the technique of shifting. \( f(x)=2 x^{2}-28 x+102 \) Complete the square by entering the correct numbers into the expression below. \( f(x)=\square(x-\square)^{2}+\square \)

Ask by Rogers Pierce. in the United States
Feb 26,2025

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Answer

\( f(x) = 2(x - 7)^2 + 4 \)

Solution

We start with the quadratic function:   f(x) = 2x² – 28x + 102 Step 1. Factor out the coefficient of x² from the first two terms:   f(x) = 2(x² – 14x) + 102 Step 2. Complete the square for the expression in parentheses:   Take half of the coefficient of x (which is –14), giving –7.   Square –7 to get 49.   Rewrite the expression:     x² – 14x = (x² – 14x + 49) – 49 = (x – 7)² – 49 Step 3. Substitute this back into the function:   f(x) = 2[(x – 7)² – 49] + 102      = 2(x – 7)² – 98 + 102      = 2(x – 7)² + 4 Thus, in the form f(x) = □(x – □)² + □, the numbers are:   First box: 2   Second box: 7   Third box: 4 Graphing using shifting: 1. The vertex form f(x) = 2(x – 7)² + 4 shows the vertex is at (7, 4). 2. Shift the basic parabola y = x² right by 7 units and up by 4 units. 3. The factor of 2 indicates the parabola is vertically stretched (narrower than y = x²). So, the final completed square form is:   f(x) = 2(x – 7)² + 4

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To complete the square for the expression \( f(x) = 2x^2 - 28x + 102 \), we first factor out the 2 from the quadratic and linear terms: \( f(x) = 2(x^2 - 14x) + 102 \). Next, we need to complete the square inside the parentheses. We take the coefficient of \( x \), which is -14, halve it to get -7, and then square it to get 49. We then rewrite the expression: \( f(x) = 2(x^2 - 14x + 49 - 49) + 102 \). This simplifies to: \( f(x) = 2((x - 7)^2 - 49) + 102 \) \( = 2(x - 7)^2 - 98 + 102 \) \( = 2(x - 7)^2 + 4 \). Thus, we can fill in the squares as follows: \( f(x) = 2(x - 7)^2 + 4 \). --- Now, when it comes to graphing, you'll notice that the vertex form of the quadratic is particularly revealing! The vertex of this parabola is at the point (7, 4), which is the minimum point of the function since the coefficient of the squared term is positive. To graph this function using the technique of shifting, you'll start with the basic parent function \( y = x^2 \) and shift it right by 7 units and up by 4 units. Remember, the parabola will open upwards and be stretched vertically since we have a coefficient of 2 in front. Happy graphing!

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