Grant Lynch
01/31/2023 · High School
minimum value of the function \( f(x)=2 x^{2}-7 x+10.8 \) to the
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Step-by-step Solution
To find the minimum value of the function \( f(x)=2x^{2}-7x+10.8 \), we need to find the vertex of the parabola represented by the function. The vertex of a parabola in the form \( f(x)=ax^{2}+bx+c \) is given by the formula \( x=-\frac{b}{2a} \).
In this case, the function is \( f(x)=2x^{2}-7x+10.8 \), so \( a=2 \) and \( b=-7 \).
Let's calculate the x-coordinate of the vertex using the formula \( x=-\frac{b}{2a} \).
Calculate the value by following steps:
- step0: Calculate:
\(-\frac{\left(-7\right)}{\left(2\times 2\right)}\)
- step1: Remove the parentheses:
\(-\frac{-7}{2\times 2}\)
- step2: Use the rules for multiplication and division:
\(\frac{7}{2\times 2}\)
- step3: Multiply the numbers:
\(\frac{7}{4}\)
The x-coordinate of the vertex is \( x=\frac{7}{4} \) or \( x=1.75 \).
Now, we can substitute this value back into the function \( f(x)=2x^{2}-7x+10.8 \) to find the minimum value of the function. Let's calculate this.
Calculate the value by following steps:
- step0: Calculate:
\(2\left(\frac{7}{4}\right)^{2}-7\times \frac{7}{4}+10.8\)
- step1: Multiply the terms:
\(\frac{49}{8}-7\times \frac{7}{4}+10.8\)
- step2: Multiply the numbers:
\(\frac{49}{8}-\frac{49}{4}+10.8\)
- step3: Rewrite the expression:
\(\frac{49}{8}-\frac{49}{4}+\frac{54}{5}\)
- step4: Reduce fractions to a common denominator:
\(\frac{49\times 5}{8\times 5}-\frac{49\times 10}{4\times 10}+\frac{54\times 8}{5\times 8}\)
- step5: Calculate:
\(\frac{245}{40}-\frac{490}{40}+\frac{432}{40}\)
- step6: Transform the expression:
\(\frac{245-490+432}{40}\)
- step7: Calculate:
\(\frac{187}{40}\)
The minimum value of the function \( f(x)=2x^{2}-7x+10.8 \) is \( 4.675 \).
Quick Answer
The minimum value of the function \( f(x)=2x^{2}-7x+10.8 \) is \( 4.675 \).
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