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Let 
h(x)=x^(3)-9x^(2)+7x and let 
c be the number that satisfies the Mean Value Theorem for 
h on the interval 
-3 <= x <= 6.
What is 
c ?
Choose 1 answer:
(A) -1
(B) 0
(C) 3
(D) 4

Let h(x)=x39x2+7x h(x)=x^{3}-9 x^{2}+7 x and let c c be the number that satisfies the Mean Value Theorem for h h on the interval 3x6 -3 \leq x \leq 6 .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 1-1\newline(B) 00\newline(C) 33\newline(D) 44

Full solution

Q. Let h(x)=x39x2+7x h(x)=x^{3}-9 x^{2}+7 x and let c c be the number that satisfies the Mean Value Theorem for h h on the interval 3x6 -3 \leq x \leq 6 .\newlineWhat is c c ?\newlineChoose 11 answer:\newline(A) 1-1\newline(B) 00\newline(C) 33\newline(D) 44
  1. Mean Value Theorem: The 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]. The average rate of change is given by f(b)f(a)ba\frac{f(b) - f(a)}{b - a}.
  2. Calculate Endpoints: First, we need to find the values of h(x)h(x) at the endpoints of the interval. These are h(3)h(-3) and h(6)h(6).
    h(3)=(3)39(3)2+7(3)=278121=129.h(-3) = (-3)^3 - 9(-3)^2 + 7(-3) = -27 - 81 - 21 = -129.
    h(6)=(6)39(6)2+7(6)=216324+42=66.h(6) = (6)^3 - 9(6)^2 + 7(6) = 216 - 324 + 42 = -66.
  3. Calculate Average Rate: Now, we calculate the average rate of change of h(x)h(x) over the interval [3,6][-3, 6].\newlineAverage rate of change = h(6)h(3)6(3)=66(129)6+3=639=7\frac{h(6) - h(-3)}{6 - (-3)} = \frac{-66 - (-129)}{6 + 3} = \frac{63}{9} = 7.
  4. Find Derivative: Next, we find the derivative of h(x)h(x), which is h(x)h'(x).h(x)=ddx[x39x2+7x]=3x218x+7h'(x) = \frac{d}{dx} [x^3 - 9x^2 + 7x] = 3x^2 - 18x + 7.
  5. Apply Mean Value Theorem: According to the Mean Value Theorem, there exists a number cc such that h(c)=7h'(c) = 7 (the average rate of change we calculated).\newlineSo we set the derivative equal to 77 and solve for cc:\newline3c218c+7=73c^2 - 18c + 7 = 7.
  6. Set Derivative Equal: Subtract 77 from both sides to set the equation to zero:\newline3c218c=0.3c^2 - 18c = 0.
  7. Factor and Solve: Factor out the common term cc:c(3c18)=0c(3c - 18) = 0.
  8. Final Value of c: Set each factor equal to zero and solve for c:\newlinec=0c = 0 or 3c18=03c - 18 = 0.
  9. Final Value of cc: Set each factor equal to zero and solve for cc:c=0c = 0 or 3c18=03c - 18 = 0.If 3c18=03c - 18 = 0, then 3c=183c = 18 and c=6c = 6. However, c=6c = 6 is an endpoint of the interval and cannot be the value we are looking for according to the Mean Value Theorem. Therefore, the only possible value for cc within the interval (3,6)(-3, 6) is c=0c = 0.

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