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What is the value of 
(d)/(dx)(sqrt(x^(3))) at 
x=25 ?

What is the value of ddx(x3) \frac{d}{d x}\left(\sqrt{x^{3}}\right) at x=25 x=25 ?

Full solution

Q. What is the value of ddx(x3) \frac{d}{d x}\left(\sqrt{x^{3}}\right) at x=25 x=25 ?
  1. Rewrite function: We need to find the derivative of the function f(x)=x3f(x) = \sqrt{x^3} with respect to xx. The function can be rewritten as f(x)=(x3)12f(x) = (x^3)^{\frac{1}{2}}.
  2. Apply chain rule: To differentiate f(x)=(x3)12f(x) = (x^3)^{\frac{1}{2}}, we will use the chain rule. The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.
  3. Find outer function derivative: The outer function is g(u)=u12g(u) = u^{\frac{1}{2}} and the inner function is u(x)=x3u(x) = x^3. We will first find the derivative of the outer function, g(u)=(12)u12g'(u) = \left(\frac{1}{2}\right)u^{-\frac{1}{2}}.
  4. Find inner function derivative: Next, we find the derivative of the inner function, u(x)=3x2u'(x) = 3x^2.
  5. Apply chain rule again: Now we apply the chain rule: f(x)=g(u(x))u(x)f'(x) = g'(u(x)) \cdot u'(x). Substituting the derivatives we found, we get f(x)=(12)(x3)123x2f'(x) = \left(\frac{1}{2}\right)\left(x^3\right)^{-\frac{1}{2}} \cdot 3x^2.
  6. Simplify expression: Simplify the expression: f(x)=(32)x2(x3)12f'(x) = \left(\frac{3}{2}\right)x^2 \cdot \left(x^3\right)^{-\frac{1}{2}}.
  7. Rewrite with single exponent: Rewrite the expression with a single exponent: f(x)=(32)x232=(32)x12f'(x) = \left(\frac{3}{2}\right)x^{2 - \frac{3}{2}} = \left(\frac{3}{2}\right)x^{\frac{1}{2}}.
  8. Evaluate derivative at x=25x=25: Now we evaluate the derivative at x=25x = 25: f(25)=(32)(25)12f'(25) = \left(\frac{3}{2}\right)(25)^{\frac{1}{2}}.
  9. Calculate final value: Since the square root of 2525 is 55, we have f(25)=(32)×5f'(25) = (\frac{3}{2}) \times 5.
  10. Calculate final value: Since the square root of 2525 is 55, we have f(25)=(32)×5f'(25) = (\frac{3}{2}) \times 5.Finally, we calculate the value: f(25)=(32)×5=152=7.5f'(25) = (\frac{3}{2}) \times 5 = \frac{15}{2} = 7.5.

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