Calculus Examples

$50 \sqrt{25^{2} + {(8 - x)}^{2}} + 20 \sqrt{5^{2} + x^{2}}$

Step 1

By the Sum Rule, the derivative of $50 \sqrt{25^{2} + {(8 - x)}^{2}} + 20 \sqrt{5^{2} + x^{2}}$ with respect to $x$ is $\frac{d}{d x} [50 \sqrt{25^{2} + {(8 - x)}^{2}}] + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$ .

$\frac{d}{d x} [50 \sqrt{25^{2} + {(8 - x)}^{2}}] + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2

Evaluate $\frac{d}{d x} [50 \sqrt{25^{2} + {(8 - x)}^{2}}]$ .

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Step 2.1

Raise $25$ to the power of $2$ .

$\frac{d}{d x} [50 \sqrt{625 + {(8 - x)}^{2}}] + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{625 + {(8 - x)}^{2}}$ as ${(625 + {(8 - x)}^{2})}^{\frac{1}{2}}$ .

$\frac{d}{d x} [50 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}] + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.3

Since $50$ is constant with respect to $x$ , the derivative of $50 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}$ with respect to $x$ is $50 \frac{d}{d x} [{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}]$ .

$50 \frac{d}{d x} [{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}] + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = 625 + {(8 - x)}^{2}$ .

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Step 2.4.1

To apply the Chain Rule, set $u_{1}$ as $625 + {(8 - x)}^{2}$ .

$50 (\frac{d}{d u_{1}} [{u_{1}}^{\frac{1}{2}}] \frac{d}{d x} [625 + {(8 - x)}^{2}]) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.4.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{1}} [{u_{1}}^{n}]$ is $n {u_{1}}^{n - 1}$ where $n = \frac{1}{2}$ .

$50 (\frac{1}{2} {u_{1}}^{\frac{1}{2} - 1} \frac{d}{d x} [625 + {(8 - x)}^{2}]) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.4.3

Replace all occurrences of $u_{1}$ with $625 + {(8 - x)}^{2}$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} \frac{d}{d x} [625 + {(8 - x)}^{2}]) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.5

By the Sum Rule, the derivative of $625 + {(8 - x)}^{2}$ with respect to $x$ is $\frac{d}{d x} [625] + \frac{d}{d x} [{(8 - x)}^{2}]$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (\frac{d}{d x} [625] + \frac{d}{d x} [{(8 - x)}^{2}])) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.6

Since $625$ is constant with respect to $x$ , the derivative of $625$ with respect to $x$ is $0$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + \frac{d}{d x} [{(8 - x)}^{2}])) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.7

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = 8 - x$ .

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Step 2.7.1

To apply the Chain Rule, set $u_{2}$ as $8 - x$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + \frac{d}{d u_{2}} [{u_{2}}^{2}] \frac{d}{d x} [8 - x])) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.7.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{2}} [{u_{2}}^{n}]$ is $n {u_{2}}^{n - 1}$ where $n = 2$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 u_{2} \frac{d}{d x} [8 - x])) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.7.3

Replace all occurrences of $u_{2}$ with $8 - x$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 (8 - x) \frac{d}{d x} [8 - x])) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.8

By the Sum Rule, the derivative of $8 - x$ with respect to $x$ is $\frac{d}{d x} [8] + \frac{d}{d x} [- x]$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 (8 - x) (\frac{d}{d x} [8] + \frac{d}{d x} [- x]))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.9

Since $8$ is constant with respect to $x$ , the derivative of $8$ with respect to $x$ is $0$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 (8 - x) (0 + \frac{d}{d x} [- x]))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.10

Since $- 1$ is constant with respect to $x$ , the derivative of $- x$ with respect to $x$ is $- \frac{d}{d x} [x]$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 (8 - x) (0 - \frac{d}{d x} [x]))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.11

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.12

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.13

Combine $- 1$ and $\frac{2}{2}$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.14

Combine the numerators over the common denominator.

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1 - 1 \cdot 2}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.15

Simplify the numerator.

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Step 2.15.1

Multiply $- 1$ by $2$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{1 - 2}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.15.2

Subtract $2$ from $1$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{\frac{- 1}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.16

Move the negative in front of the fraction.

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}} (0 + 2 (8 - x) (0 - 1 \cdot 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.17

Multiply $- 1$ by $1$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}} (0 + 2 (8 - x) (0 - 1))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.18

Subtract $1$ from $0$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}} (0 + 2 (8 - x) \cdot - 1)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.19

Multiply $- 1$ by $2$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}} (0 - 2 (8 - x))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.20

Subtract $2 (8 - x)$ from $0$ .

$50 (\frac{1}{2} {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}} (- 2 (8 - x))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.21

Combine $\frac{1}{2}$ and ${(625 + {(8 - x)}^{2})}^{- \frac{1}{2}}$ .

$50 (\frac{{(625 + {(8 - x)}^{2})}^{- \frac{1}{2}}}{2} (- 2 (8 - x))) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.22

Combine $- 2$ and $\frac{{(625 + {(8 - x)}^{2})}^{- \frac{1}{2}}}{2}$ .

$50 (\frac{- 2 {(625 + {(8 - x)}^{2})}^{- \frac{1}{2}}}{2} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.23

Move ${(625 + {(8 - x)}^{2})}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$50 (\frac{- 2}{2 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.24

Factor $2$ out of $- 2$ .

$50 (\frac{2 \cdot - 1}{2 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.25

Cancel the common factors.

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Step 2.25.1

Factor $2$ out of $2 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}$ .

$50 (\frac{2 \cdot - 1}{2 ({(625 + {(8 - x)}^{2})}^{\frac{1}{2}})} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.25.2

Cancel the common factor.

$50 (\frac{2 \cdot - 1}{2 {(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.25.3

Rewrite the expression.

$50 (\frac{- 1}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.26

Move the negative in front of the fraction.

$50 (- \frac{1}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.27

Multiply $- 1$ by $50$ .

$- 50 (\frac{1}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.28

Combine $\frac{1}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}}$ and $- 50$ .

$\frac{- 50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 2.29

Move the negative in front of the fraction.

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + \frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$

Step 3

Evaluate $\frac{d}{d x} [20 \sqrt{5^{2} + x^{2}}]$ .

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Step 3.1

Raise $5$ to the power of $2$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + \frac{d}{d x} [20 \sqrt{25 + x^{2}}]$

Step 3.2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{25 + x^{2}}$ as ${(25 + x^{2})}^{\frac{1}{2}}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + \frac{d}{d x} [20 {(25 + x^{2})}^{\frac{1}{2}}]$

Step 3.3

Since $20$ is constant with respect to $x$ , the derivative of $20 {(25 + x^{2})}^{\frac{1}{2}}$ with respect to $x$ is $20 \frac{d}{d x} [{(25 + x^{2})}^{\frac{1}{2}}]$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 \frac{d}{d x} [{(25 + x^{2})}^{\frac{1}{2}}]$

Step 3.4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = 25 + x^{2}$ .

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Step 3.4.1

To apply the Chain Rule, set $u_{3}$ as $25 + x^{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{d}{d u_{3}} [{u_{3}}^{\frac{1}{2}}] \frac{d}{d x} [25 + x^{2}])$

Step 3.4.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{3}} [{u_{3}}^{n}]$ is $n {u_{3}}^{n - 1}$ where $n = \frac{1}{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {u_{3}}^{\frac{1}{2} - 1} \frac{d}{d x} [25 + x^{2}])$

Step 3.4.3

Replace all occurrences of $u_{3}$ with $25 + x^{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} - 1} \frac{d}{d x} [25 + x^{2}])$

Step 3.5

By the Sum Rule, the derivative of $25 + x^{2}$ with respect to $x$ is $\frac{d}{d x} [25] + \frac{d}{d x} [x^{2}]$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} - 1} (\frac{d}{d x} [25] + \frac{d}{d x} [x^{2}]))$

Step 3.6

Since $25$ is constant with respect to $x$ , the derivative of $25$ with respect to $x$ is $0$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} - 1} (0 + \frac{d}{d x} [x^{2}]))$

Step 3.7

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} - 1} (0 + 2 x))$

Step 3.8

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} (0 + 2 x))$

Step 3.9

Combine $- 1$ and $\frac{2}{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} (0 + 2 x))$

Step 3.10

Combine the numerators over the common denominator.

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1 - 1 \cdot 2}{2}} (0 + 2 x))$

Step 3.11

Simplify the numerator.

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Step 3.11.1

Multiply $- 1$ by $2$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{1 - 2}{2}} (0 + 2 x))$

Step 3.11.2

Subtract $2$ from $1$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{\frac{- 1}{2}} (0 + 2 x))$

Step 3.12

Move the negative in front of the fraction.

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{- \frac{1}{2}} (0 + 2 x))$

Step 3.13

Add $0$ and $2 x$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{1}{2} {(25 + x^{2})}^{- \frac{1}{2}} (2 x))$

Step 3.14

Combine $\frac{1}{2}$ and ${(25 + x^{2})}^{- \frac{1}{2}}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{{(25 + x^{2})}^{- \frac{1}{2}}}{2} (2 x))$

Step 3.15

Combine $2$ and $\frac{{(25 + x^{2})}^{- \frac{1}{2}}}{2}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 (\frac{2 {(25 + x^{2})}^{- \frac{1}{2}}}{2} x)$

Step 3.16

Combine $\frac{2 {(25 + x^{2})}^{- \frac{1}{2}}}{2}$ and $x$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 \frac{2 {(25 + x^{2})}^{- \frac{1}{2}} x}{2}$

Step 3.17

Move ${(25 + x^{2})}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 \frac{2 x}{2 {(25 + x^{2})}^{\frac{1}{2}}}$

Step 3.18

Cancel the common factor.

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 \frac{2 x}{2 {(25 + x^{2})}^{\frac{1}{2}}}$

Step 3.19

Rewrite the expression.

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 \frac{x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 3.20

Combine $20$ and $\frac{x}{{(25 + x^{2})}^{\frac{1}{2}}}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + \frac{20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4

Simplify.

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Step 4.1

Combine terms.

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Step 4.1.1

To write $- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)$ as a fraction with a common denominator, multiply by $\frac{{(25 + x^{2})}^{\frac{1}{2}}}{{(25 + x^{2})}^{\frac{1}{2}}}$ .

$- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) \cdot \frac{{(25 + x^{2})}^{\frac{1}{2}}}{{(25 + x^{2})}^{\frac{1}{2}}} + \frac{20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4.1.2

Combine $- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x)$ and $\frac{{(25 + x^{2})}^{\frac{1}{2}}}{{(25 + x^{2})}^{\frac{1}{2}}}$ .

$\frac{- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) {(25 + x^{2})}^{\frac{1}{2}}}{{(25 + x^{2})}^{\frac{1}{2}}} + \frac{20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4.1.3

Combine the numerators over the common denominator.

$\frac{- \frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) {(25 + x^{2})}^{\frac{1}{2}} + 20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4.1.4

Combine ${(25 + x^{2})}^{\frac{1}{2}}$ and $\frac{50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}}$ .

$\frac{- \frac{{(25 + x^{2})}^{\frac{1}{2}} \cdot 50}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4.1.5

Move $50$ to the left of ${(25 + x^{2})}^{\frac{1}{2}}$ .

$\frac{- \frac{50 {(25 + x^{2})}^{\frac{1}{2}}}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} (8 - x) + 20 x}{{(25 + x^{2})}^{\frac{1}{2}}}$

Step 4.2

Reorder terms.

$\frac{- (8 - x) \frac{50 {(25 + x^{2})}^{\frac{1}{2}}}{{(625 + {(8 - x)}^{2})}^{\frac{1}{2}}} + 20 x}{{(x^{2} + 25)}^{\frac{1}{2}}}$