Let g(x)=5x−1 and let c be the number that satisfies the Mean Value Theorem for g on the interval [1,10].What is c ?Choose 1 answer:(A) 2.25(B) 4.25(C) 6.5(D) 8
Q. Let g(x)=5x−1 and let c be the number that satisfies the Mean Value Theorem for g on the interval [1,10].What is c ?Choose 1 answer:(A) 2.25(B) 4.25(C) 6.5(D) 8
Define Mean Value Theorem: The Mean Value Theorem states that if a function is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), then there exists at least one number c in the interval (a,b) such that g′(c)=b−ag(b)−g(a). Let's calculate g′(x) first.
Calculate g′(x): To find g′(x), we need to differentiate g(x)=5x−1. Using the chain rule, g′(x)=(21)⋅(5x−1)−21⋅5.
Find Change in g: Now we simplify g′(x) to get g′(x)=2⋅5x−15.
Find Change in x: Next, we calculate g(10) and g(1) to find the change in g over the interval [1,10]. g(10)=5×10−1=49=7 and g(1)=5×1−1=4=2.
Apply Mean Value Theorem: Now we find the change in g over the interval [1,10], which is g(10)−g(1)=7−2=5.
Set up Equation: We also find the change in x over the interval [1,10], which is 10−1=9.
Cross-Multiply: Now we can set up the equation from the Mean Value Theorem: g′(c)=10−1g(10)−g(1). Substituting the values we have, we get 2⋅5c−15=95.
Solve for c: We can now solve for c by cross-multiplying: 5×9=2×5c−1×5.
Eliminate Square Root: Simplifying the equation, we get 45=10×5c−1.
Calculate c: Dividing both sides by 10, we get 4.5=5c−1.
Calculate c: Dividing both sides by 10, we get 4.5=5c−1. Squaring both sides to eliminate the square root, we get 4.52=(5c−1).
Calculate c: Dividing both sides by 10, we get 4.5=5c−1. Squaring both sides to eliminate the square root, we get 4.52=(5c−1). Calculating 4.52 gives us 20.25=5c−1.
Calculate c: Dividing both sides by 10, we get 4.5=5c−1. Squaring both sides to eliminate the square root, we get 4.52=(5c−1). Calculating 4.52 gives us 20.25=5c−1. Adding 1 to both sides, we get 20.25+1=5c.
Calculate c: Dividing both sides by 10, we get 4.5=5c−1. Squaring both sides to eliminate the square root, we get 4.52=(5c−1). Calculating 4.52 gives us 20.25=5c−1. Adding 1 to both sides, we get 20.25+1=5c. Simplifying, we get 21.25=5c.
Calculate c: Dividing both sides by 10, we get 4.5=5c−1. Squaring both sides to eliminate the square root, we get 4.52=(5c−1). Calculating 4.52 gives us 20.25=5c−1. Adding 1 to both sides, we get 20.25+1=5c. Simplifying, we get 21.25=5c. Finally, dividing both sides by 5, we find c=521.25=4.25.
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