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Let 
g(x)=x^(3)-16 x 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

Let g(x)=x316x g(x)=x^{3}-16 x and let c c be the number that satisfies the Mean Value Theorem for g g on the interval [4,2] [-4,2] .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 3-3\newline(B) 2-2\newline(C) 00\newline(D) 11

Full solution

Q. Let g(x)=x316x g(x)=x^{3}-16 x and let c c be the number that satisfies the Mean Value Theorem for g g on the interval [4,2] [-4,2] .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 3-3\newline(B) 2-2\newline(C) 00\newline(D) 11
  1. Check Conditions: To apply the Mean Value Theorem (MVT), we need to ensure that the function g(x)g(x) is continuous on the closed interval [4,2][-4, 2] and differentiable on the open interval (4,2)(-4, 2). The function g(x)=x316xg(x) = x^3 - 16x is a polynomial, which is continuous and differentiable everywhere. Therefore, it satisfies the conditions for the MVT.
  2. Apply MVT: The MVT states that there exists at least one number cc in the open interval (4,2)(-4, 2) such that g(c)g'(c) is equal to the average rate of change of the function over the interval [4,2][-4, 2]. The average rate of change is given by g(b)g(a)ba\frac{g(b) - g(a)}{b - a}, where a=4a = -4 and b=2b = 2.
  3. Calculate g(4)g(-4) and g(2)g(2): First, we calculate g(4)g(-4) and g(2)g(2). g(4)=(4)316(4)=64+64=0g(-4) = (-4)^3 - 16(-4) = -64 + 64 = 0, and g(2)=(2)316(2)=832=24g(2) = (2)^3 - 16(2) = 8 - 32 = -24.
  4. 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\.
  5. Find g(x)g'(x): Next, we find g(x)g'(x), which is the derivative of g(x)g(x) with respect to xx. g(x)=ddx[x316x]=3x216g'(x) = \frac{d}{dx} [x^3 - 16x] = 3x^2 - 16.
  6. Set up MVT equation: According to the MVT, there exists a number cc such that g(c)=4g'(c) = -4. So we set the derivative equal to 4-4 and solve for cc: 3c216=43c^2 - 16 = -4.
  7. Solve for cc: We rearrange the equation to solve for cc: 3c216+4=03c^2 - 16 + 4 = 0, which simplifies to 3c212=03c^2 - 12 = 0.
  8. Factor Quadratic Equation: Divide both sides by 33 to simplify further: c24=0c^2 - 4 = 0.
  9. Check Solutions: Now we factor the quadratic equation: c - \(2)(c + 22) = 00\.
  10. Final Result: Setting each factor equal to zero gives us two possible solutions for cc: c2=0c - 2 = 0 or c+2=0c + 2 = 0, which means c=2c = 2 or c=2c = -2.
  11. Final Result: Setting each factor equal to zero gives us two possible solutions for cc: c2=0c - 2 = 0 or c+2=0c + 2 = 0, which means c=2c = 2 or c=2c = -2.However, we must check which of these solutions lies within the open interval (4,2)(-4, 2). The number c=2c = 2 does not lie within the interval (4,2)(-4, 2), but c=2c = -2 does. Therefore, c=2c = -2 is the number that satisfies the Mean Value Theorem for c2=0c - 2 = 000 on the interval c2=0c - 2 = 011.

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