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Let 
f(x)=x^(3)+6x^(2)+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

Let f(x)=x3+6x2+6x f(x)=x^{3}+6 x^{2}+6 x and let c c be the number that satisfies the Mean Value Theorem for f f on the interval [6,0] [-6,0] .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 5-5\newline(B) 4-4\newline(C) 3-3\newline(D) 1-1

Full solution

Q. Let f(x)=x3+6x2+6x f(x)=x^{3}+6 x^{2}+6 x and let c c be the number that satisfies the Mean Value Theorem for f f on the interval [6,0] [-6,0] .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 5-5\newline(B) 4-4\newline(C) 3-3\newline(D) 1-1
  1. Understand MVT: Understand the Mean Value Theorem (MVT) and what it states.\newlineThe Mean Value Theorem states that if a function ff is continuous on the closed interval [a,b][a, b] and differentiable on the open interval (a,b)(a, b), then there exists at least one number cc in the interval (a,b)(a, b) such that f(c)f'(c) is equal to the average rate of change of the function over [a,b][a, b]. This can be written as:\newlinef(c)=f(b)f(a)baf'(c) = \frac{f(b) - f(a)}{b - a}
  2. Calculate Average Rate: Calculate the average rate of change of the function f(x)=x3+6x2+6xf(x) = x^3 + 6x^2 + 6x over the interval [6,0][-6, 0].\newlineWe need to find f(0)f(0) and f(6)f(-6) to use in the MVT formula.\newlinef(0)=03+602+60=0f(0) = 0^3 + 6\cdot0^2 + 6\cdot0 = 0\newlinef(6)=(6)3+6(6)2+6(6)=216+21636=36f(-6) = (-6)^3 + 6\cdot(-6)^2 + 6\cdot(-6) = -216 + 216 - 36 = -36\newlineNow, we calculate the average rate of change:\newline(f(0)f(6))/(0(6))=(0(36))/6=36/6=6(f(0) - f(-6)) / (0 - (-6)) = (0 - (-36)) / 6 = 36 / 6 = 6
  3. Find Derivative: Find the derivative of the function f(x)=x3+6x2+6xf(x) = x^3 + 6x^2 + 6x.f(x)=ddx(x3+6x2+6x)=3x2+12x+6f'(x) = \frac{d}{dx} (x^3 + 6x^2 + 6x) = 3x^2 + 12x + 6
  4. Apply MVT: Apply the MVT by setting the derivative f(c)f'(c) equal to the average rate of change found in Step 22.\newlineWe have f(c)=3c2+12c+6f'(c) = 3c^2 + 12c + 6, and we want to set this equal to 66 (the average rate of change).\newline3c2+12c+6=63c^2 + 12c + 6 = 6
  5. Solve Equation: Solve the equation 3c2+12c+6=63c^2 + 12c + 6 = 6 for cc. First, subtract 66 from both sides to set the equation to zero: 3c2+12c+66=03c^2 + 12c + 6 - 6 = 0 3c2+12c=03c^2 + 12c = 0 Now, factor out the common term 3c3c: 3c(c+4)=03c(c + 4) = 0
  6. Find Values of c: Find the values of cc that satisfy the equation 3c(c+4)=03c(c + 4) = 0. We have two possible solutions for cc: c=0c = 0 or c+4=0c + 4 = 0 Since c+4=0c + 4 = 0 leads to c=4c = -4, we have two potential values for cc. However, c=0c = 0 is not in the open interval (6,0)(-6, 0), so we discard it. The value of cc that satisfies the Mean Value Theorem for 3c(c+4)=03c(c + 4) = 011 on the interval 3c(c+4)=03c(c + 4) = 022 is c=4c = -4.

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