Let f(x)=x3+6x2+6x and let c be the number that satisfies the Mean Value Theorem for f on the interval [−6,0].What is c ?Choose 1 answer:(A) −5(B) −4(C) −3(D) −1
Q. Let f(x)=x3+6x2+6x and let c be the number that satisfies the Mean Value Theorem for f on the interval [−6,0].What is c ?Choose 1 answer:(A) −5(B) −4(C) −3(D) −1
Understand MVT: Understand the Mean Value Theorem (MVT) and what it states.The Mean Value Theorem states that if a function f 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 f′(c) is equal to the average rate of change of the function over [a,b]. This can be written as:f′(c)=b−af(b)−f(a)
Calculate Average Rate: Calculate the average rate of change of the function f(x)=x3+6x2+6x over the interval [−6,0].We need to find f(0) and f(−6) to use in the MVT formula.f(0)=03+6⋅02+6⋅0=0f(−6)=(−6)3+6⋅(−6)2+6⋅(−6)=−216+216−36=−36Now, we calculate the average rate of change:(f(0)−f(−6))/(0−(−6))=(0−(−36))/6=36/6=6
Find Derivative: Find the derivative of the function f(x)=x3+6x2+6x.f′(x)=dxd(x3+6x2+6x)=3x2+12x+6
Apply MVT: Apply the MVT by setting the derivative f′(c) equal to the average rate of change found in Step 2.We have f′(c)=3c2+12c+6, and we want to set this equal to 6 (the average rate of change).3c2+12c+6=6
Solve Equation: Solve the equation 3c2+12c+6=6 for c. First, subtract 6 from both sides to set the equation to zero: 3c2+12c+6−6=03c2+12c=0 Now, factor out the common term 3c: 3c(c+4)=0
Find Values of c: Find the values of c that satisfy the equation 3c(c+4)=0. We have two possible solutions for c: c=0 or c+4=0 Since c+4=0 leads to c=−4, we have two potential values for c. However, c=0 is not in the open interval (−6,0), so we discard it. The value of c that satisfies the Mean Value Theorem for 3c(c+4)=01 on the interval 3c(c+4)=02 is c=−4.