Let g(x)=x3−16x and let c be the number that satisfies the Mean Value Theorem for g on the interval [−4,2].What is c ?Choose 1 answer:(A) −3(B) −2(C) 0(D) 1
Q. Let g(x)=x3−16x and let c be the number that satisfies the Mean Value Theorem for g on the interval [−4,2].What is c ?Choose 1 answer:(A) −3(B) −2(C) 0(D) 1
Check Conditions: To apply the Mean Value Theorem (MVT), we need to ensure that the function g(x) is continuous on the closed interval [−4,2] and differentiable on the open interval (−4,2). The function g(x)=x3−16x is a polynomial, which is continuous and differentiable everywhere. Therefore, it satisfies the conditions for the MVT.
Apply MVT: The MVT states that there exists at least one number c in the open interval (−4,2) such that g′(c) is equal to the average rate of change of the function over the interval [−4,2]. The average rate of change is given by b−ag(b)−g(a), where a=−4 and b=2.
Calculate g(−4) and g(2): First, we calculate g(−4) and g(2). g(−4)=(−4)3−16(−4)=−64+64=0, and g(2)=(2)3−16(2)=8−32=−24.
Calculate Average Rate of Change: Now, we calculate the average rate of change: \frac{g(\(2\)) - g(\(-4\))}{\(2\) - (\(-4\))} = \frac{\(-24\) - \(0\)}{\(2\) + \(4\)} = \frac{\(-24\)}{\(6\)} = \(-4\.
Find g′(x): Next, we find g′(x), which is the derivative of g(x) with respect to x. g′(x)=dxd[x3−16x]=3x2−16.
Set up MVT equation: According to the MVT, there exists a number c such that g′(c)=−4. So we set the derivative equal to −4 and solve for c: 3c2−16=−4.
Solve for c: We rearrange the equation to solve for c: 3c2−16+4=0, which simplifies to 3c2−12=0.
Factor Quadratic Equation: Divide both sides by 3 to simplify further: c2−4=0.
Check Solutions: Now we factor the quadratic equation: c - \(2)(c + 2) = 0\.
Final Result: Setting each factor equal to zero gives us two possible solutions for c: c−2=0 or c+2=0, which means c=2 or c=−2.
Final Result: Setting each factor equal to zero gives us two possible solutions for c: c−2=0 or c+2=0, which means c=2 or c=−2.However, we must check which of these solutions lies within the open interval (−4,2). The number c=2 does not lie within the interval (−4,2), but c=−2 does. Therefore, c=−2 is the number that satisfies the Mean Value Theorem for c−2=00 on the interval c−2=01.
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