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Given the function 
f(x)=(3sqrtx)/(2)-(3)/(sqrtx), find 
f^(')(6). Express your answer as a single fraction in simplest radical form.
Answer: 
f^(')(6)=

Given the function f(x)=3x23x f(x)=\frac{3 \sqrt{x}}{2}-\frac{3}{\sqrt{x}} , find f(6) f^{\prime}(6) . Express your answer as a single fraction in simplest radical form.\newlineAnswer: f(6)= f^{\prime}(6)=

Full solution

Q. Given the function f(x)=3x23x f(x)=\frac{3 \sqrt{x}}{2}-\frac{3}{\sqrt{x}} , find f(6) f^{\prime}(6) . Express your answer as a single fraction in simplest radical form.\newlineAnswer: f(6)= f^{\prime}(6)=
  1. Find Derivative of Function: First, we need to find the derivative of the function f(x)=3x23xf(x) = \frac{3\sqrt{x}}{2} - \frac{3}{\sqrt{x}}. To do this, we will use the power rule for differentiation. The square root of xx can be written as x1/2x^{1/2}, so the function becomes f(x)=32x1/23x1/2f(x) = \frac{3}{2}x^{1/2} - 3x^{-1/2}.
  2. Differentiate First Term: Now, let's differentiate the first term (32)x(12)(\frac{3}{2})x^{(\frac{1}{2})}. Using the power rule, the derivative of xnx^{n} is nx(n1)n\cdot x^{(n-1)}, so the derivative of (32)x(12)(\frac{3}{2})x^{(\frac{1}{2})} is (32)(12)x(121)=(34)x(12)(\frac{3}{2})\cdot(\frac{1}{2})\cdot x^{(\frac{1}{2} - 1)} = (\frac{3}{4})x^{(-\frac{1}{2})}.
  3. Differentiate Second Term: Next, we differentiate the second term 3x1/2-3x^{-1/2}. Again, using the power rule, the derivative of 3x1/2-3x^{-1/2} is 3(1/2)x1/21=(3/2)x3/2-3*(-1/2)*x^{-1/2 - 1} = (3/2)x^{-3/2}.
  4. Combine Derivatives: Combining the derivatives of both terms, we get the derivative of the function f(x)f(x), which is f(x)=34x12+32x32f'(x) = \frac{3}{4}x^{-\frac{1}{2}} + \frac{3}{2}x^{-\frac{3}{2}}.
  5. Evaluate at x=6x=6: Now we need to evaluate the derivative at x=6x=6. Substituting xx with 66, we get f(6)=(34)(6)12+(32)(6)32f'(6) = (\frac{3}{4})(6)^{-\frac{1}{2}} + (\frac{3}{2})(6)^{-\frac{3}{2}}.
  6. Simplify Square Root and Cube Root: To simplify, we calculate the square root and the cube root of 66. The square root of 66 is 6\sqrt{6}, and the cube root of 66 is 63/2=(6)36^{3/2} = (\sqrt{6})^3. So, f(6)=34(16)+32(1(6)3)f'(6) = \frac{3}{4}(\frac{1}{\sqrt{6}}) + \frac{3}{2}(\frac{1}{(\sqrt{6})^3}).
  7. Find Common Denominator: We can simplify the expression further by finding a common denominator. The common denominator for 6\sqrt{6} and (6)3(\sqrt{6})^3 is (6)3(\sqrt{6})^3. So, we multiply the first term by 66\frac{\sqrt{6}}{\sqrt{6}} to get the common denominator. f'(\(6) = \left(\frac{33}{44}\right)\left(\frac{\sqrt{66}}{\sqrt{66}}\right)\left(\frac{11}{\sqrt{66}}\right) + \left(\frac{33}{22}\right)\left(\frac{11}{(\sqrt{66})^33}\right) = \frac{33\sqrt{66}}{44\sqrt{66}^22} + \left(\frac{33}{22}\right)\left(\frac{11}{\sqrt{66}^33}\right).
  8. Combine Terms with Common Denominator: Simplifying the denominators, we have 62=6\sqrt{6^2} = 6 and 63=66\sqrt{6^3} = 6\sqrt{6}. So, f(6)=3646+32(166)=3624+32(166).f'(6) = \frac{3\sqrt{6}}{4\cdot 6} + \frac{3}{2}\left(\frac{1}{6\sqrt{6}}\right) = \frac{3\sqrt{6}}{24} + \frac{3}{2}\left(\frac{1}{6\sqrt{6}}\right).
  9. Simplify Fraction: Now, we combine the terms over a common denominator, which is 24624\sqrt{6}. To do this, we multiply the second term by 44\frac{4}{4} to get the common denominator. f(6)=3624+32(4246)=3624+6246f'(6) = \frac{3\sqrt{6}}{24} + \frac{3}{2}\left(\frac{4}{24\sqrt{6}}\right) = \frac{3\sqrt{6}}{24} + \frac{6}{24\sqrt{6}}.
  10. Factor Out 33 from Numerator: Adding the two fractions together, we get f(6)=36+6246f'(6) = \frac{3\sqrt{6} + 6}{24\sqrt{6}}. This is the derivative of the function f(x)f(x) evaluated at x=6x=6.
  11. Factor Out 33 from Numerator: Adding the two fractions together, we get f(6)=36+6246f'(6) = \frac{3\sqrt{6} + 6}{24\sqrt{6}}. This is the derivative of the function f(x)f(x) evaluated at x=6x=6.Finally, we simplify the fraction by factoring out a 33 from the numerator. f(6)=3(6+2)246f'(6) = \frac{3(\sqrt{6} + 2)}{24\sqrt{6}}. We can simplify this further by dividing both the numerator and the denominator by 33. f(6)=6+286f'(6) = \frac{\sqrt{6} + 2}{8\sqrt{6}}.

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