Calculus Examples

$y = {(2 x + 3)}^{3} \sqrt{4 x^{3} - 1}$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{4 x^{3} - 1}$ as ${(4 x^{3} - 1)}^{\frac{1}{2}}$ .

$\frac{d}{d x} [{(2 x + 3)}^{3} {(4 x^{3} - 1)}^{\frac{1}{2}}]$

Step 2

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = {(2 x + 3)}^{3}$ and $g (x) = {(4 x^{3} - 1)}^{\frac{1}{2}}$ .

${(2 x + 3)}^{3} \frac{d}{d x} [{(4 x^{3} - 1)}^{\frac{1}{2}}] + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 3

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 $g (x) = 4 x^{3} - 1$ .

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Step 3.1

To apply the Chain Rule, set $u_{1}$ as $4 x^{3} - 1$ .

${(2 x + 3)}^{3} (\frac{d}{d u_{1}} [{u_{1}}^{\frac{1}{2}}] \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 3.2

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

${(2 x + 3)}^{3} (\frac{1}{2} {u_{1}}^{\frac{1}{2} - 1} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 3.3

Replace all occurrences of $u_{1}$ with $4 x^{3} - 1$ .

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{1}{2} - 1} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 4

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

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 5

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

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 6

Combine the numerators over the common denominator.

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{1 - 2}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 7.2

Subtract $2$ from $1$ .

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{\frac{- 1}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 8

Combine fractions.

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Step 8.1

Move the negative in front of the fraction.

${(2 x + 3)}^{3} (\frac{1}{2} {(4 x^{3} - 1)}^{- \frac{1}{2}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 8.2

Combine $\frac{1}{2}$ and ${(4 x^{3} - 1)}^{- \frac{1}{2}}$ .

${(2 x + 3)}^{3} (\frac{{(4 x^{3} - 1)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 8.3

Move ${(4 x^{3} - 1)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

${(2 x + 3)}^{3} (\frac{1}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} \frac{d}{d x} [4 x^{3} - 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 8.4

Combine $\frac{1}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}}$ and ${(2 x + 3)}^{3}$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} \frac{d}{d x} [4 x^{3} - 1] + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 9

By the Sum Rule, the derivative of $4 x^{3} - 1$ with respect to $x$ is $\frac{d}{d x} [4 x^{3}] + \frac{d}{d x} [- 1]$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (\frac{d}{d x} [4 x^{3}] + \frac{d}{d x} [- 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 10

Since $4$ is constant with respect to $x$ , the derivative of $4 x^{3}$ with respect to $x$ is $4 \frac{d}{d x} [x^{3}]$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (4 \frac{d}{d x} [x^{3}] + \frac{d}{d x} [- 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 11

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

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (4 (3 x^{2}) + \frac{d}{d x} [- 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 12

Multiply $3$ by $4$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (12 x^{2} + \frac{d}{d x} [- 1]) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 13

Since $- 1$ is constant with respect to $x$ , the derivative of $- 1$ with respect to $x$ is $0$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (12 x^{2} + 0) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 14

Simplify terms.

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Step 14.1

Add $12 x^{2}$ and $0$ .

$\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} (12 x^{2}) + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 14.2

Combine $12$ and $\frac{{(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}}$ .

$\frac{12 {(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} x^{2} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 14.3

Combine $\frac{12 {(2 x + 3)}^{3}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}}$ and $x^{2}$ .

$\frac{12 {(2 x + 3)}^{3} x^{2}}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 14.4

Factor $2$ out of $12 {(2 x + 3)}^{3} x^{2}$ .

$\frac{2 (6 {(2 x + 3)}^{3} x^{2})}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 15

Cancel the common factors.

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Step 15.1

Factor $2$ out of $2 {(4 x^{3} - 1)}^{\frac{1}{2}}$ .

$\frac{2 (6 {(2 x + 3)}^{3} x^{2})}{2 ({(4 x^{3} - 1)}^{\frac{1}{2}})} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 15.2

Cancel the common factor.

$\frac{2 (6 {(2 x + 3)}^{3} x^{2})}{2 {(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 15.3

Rewrite the expression.

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} \frac{d}{d x} [{(2 x + 3)}^{3}]$

Step 16

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{3}$ and $g (x) = 2 x + 3$ .

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Step 16.1

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

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} (\frac{d}{d u_{2}} [{u_{2}}^{3}] \frac{d}{d x} [2 x + 3])$

Step 16.2

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

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} (3 {u_{2}}^{2} \frac{d}{d x} [2 x + 3])$

Step 16.3

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

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + {(4 x^{3} - 1)}^{\frac{1}{2}} (3 {(2 x + 3)}^{2} \frac{d}{d x} [2 x + 3])$

Step 17

Differentiate.

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Step 17.1

Move $3$ to the left of ${(4 x^{3} - 1)}^{\frac{1}{2}}$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 \cdot {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} \frac{d}{d x} [2 x + 3]$

Step 17.2

By the Sum Rule, the derivative of $2 x + 3$ with respect to $x$ is $\frac{d}{d x} [2 x] + \frac{d}{d x} [3]$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} (\frac{d}{d x} [2 x] + \frac{d}{d x} [3])$

Step 17.3

Since $2$ is constant with respect to $x$ , the derivative of $2 x$ with respect to $x$ is $2 \frac{d}{d x} [x]$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} (2 \frac{d}{d x} [x] + \frac{d}{d x} [3])$

Step 17.4

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

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} (2 \cdot 1 + \frac{d}{d x} [3])$

Step 17.5

Multiply $2$ by $1$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} (2 + \frac{d}{d x} [3])$

Step 17.6

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} (2 + 0)$

Step 17.7

Simplify the expression.

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Step 17.7.1

Add $2$ and $0$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 3 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} \cdot 2$

Step 17.7.2

Multiply $2$ by $3$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + 6 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2}$

Step 18

To write $6 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2}$ as a fraction with a common denominator, multiply by $\frac{{(4 x^{3} - 1)}^{\frac{1}{2}}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$ .

$\frac{6 {(2 x + 3)}^{3} x^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}} + \frac{6 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} {(4 x^{3} - 1)}^{\frac{1}{2}}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 19

Combine the numerators over the common denominator.

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 {(4 x^{3} - 1)}^{\frac{1}{2}} {(2 x + 3)}^{2} {(4 x^{3} - 1)}^{\frac{1}{2}}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 20

Multiply ${(4 x^{3} - 1)}^{\frac{1}{2}}$ by ${(4 x^{3} - 1)}^{\frac{1}{2}}$ by adding the exponents.

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Step 20.1

Move ${(4 x^{3} - 1)}^{\frac{1}{2}}$ .

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 ({(4 x^{3} - 1)}^{\frac{1}{2}} {(4 x^{3} - 1)}^{\frac{1}{2}}) {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 20.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 {(4 x^{3} - 1)}^{\frac{1}{2} + \frac{1}{2}} {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 20.3

Combine the numerators over the common denominator.

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 {(4 x^{3} - 1)}^{\frac{1 + 1}{2}} {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 20.4

Add $1$ and $1$ .

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 {(4 x^{3} - 1)}^{\frac{2}{2}} {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 20.5

Divide $2$ by $2$ .

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 {(4 x^{3} - 1)}^{1} {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 21

Simplify $6 {(4 x^{3} - 1)}^{1} {(2 x + 3)}^{2}$ .

$\frac{6 {(2 x + 3)}^{3} x^{2} + 6 (4 x^{3} - 1) {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22

Simplify.

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Step 22.1

Apply the distributive property.

$\frac{6 {(2 x + 3)}^{3} x^{2} + (6 (4 x^{3}) + 6 \cdot - 1) {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2

Simplify the numerator.

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Step 22.2.1

Factor ${(2 x + 3)}^{2}$ out of $6 {(2 x + 3)}^{3} x^{2} + (6 \cdot 4 x^{3} + 6 \cdot - 1) {(2 x + 3)}^{2}$ .

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Step 22.2.1.1

Factor ${(2 x + 3)}^{2}$ out of $6 {(2 x + 3)}^{3} x^{2}$ .

$\frac{{(2 x + 3)}^{2} (6 (2 x + 3) x^{2}) + (6 \cdot 4 x^{3} + 6 \cdot - 1) {(2 x + 3)}^{2}}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.1.2

Factor ${(2 x + 3)}^{2}$ out of $(6 \cdot 4 x^{3} + 6 \cdot - 1) {(2 x + 3)}^{2}$ .

$\frac{{(2 x + 3)}^{2} (6 (2 x + 3) x^{2}) + {(2 x + 3)}^{2} (6 \cdot 4 x^{3} + 6 \cdot - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.1.3

Factor ${(2 x + 3)}^{2}$ out of ${(2 x + 3)}^{2} (6 (2 x + 3) x^{2}) + {(2 x + 3)}^{2} (6 \cdot 4 x^{3} + 6 \cdot - 1)$ .

$\frac{{(2 x + 3)}^{2} (6 (2 x + 3) x^{2} + 6 \cdot 4 x^{3} + 6 \cdot - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.2

Factor $6$ out of $6 (2 x + 3) x^{2} + 6 \cdot 4 x^{3} + 6 \cdot - 1$ .

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Step 22.2.2.1

Factor $6$ out of $6 (2 x + 3) x^{2}$ .

$\frac{{(2 x + 3)}^{2} (6 ((2 x + 3) x^{2}) + 6 \cdot 4 x^{3} + 6 \cdot - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.2.2

Factor $6$ out of $6 \cdot 4 x^{3}$ .

$\frac{{(2 x + 3)}^{2} (6 ((2 x + 3) x^{2}) + 6 (4 x^{3}) + 6 \cdot - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.2.3

Factor $6$ out of $6 \cdot - 1$ .

$\frac{{(2 x + 3)}^{2} (6 ((2 x + 3) x^{2}) + 6 (4 x^{3}) + 6 (- 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.2.4

Factor $6$ out of $6 ((2 x + 3) x^{2}) + 6 (4 x^{3})$ .

$\frac{{(2 x + 3)}^{2} (6 ((2 x + 3) x^{2} + 4 x^{3}) + 6 (- 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.2.5

Factor $6$ out of $6 ((2 x + 3) x^{2} + 4 x^{3}) + 6 (- 1)$ .

$\frac{{(2 x + 3)}^{2} (6 ((2 x + 3) x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.3

Apply the distributive property.

$\frac{{(2 x + 3)}^{2} (6 (2 x \cdot x^{2} + 3 x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.4

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 22.2.4.1

Move $x^{2}$ .

$\frac{{(2 x + 3)}^{2} (6 (2 (x^{2} x) + 3 x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.4.2

Multiply $x^{2}$ by $x$ .

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Step 22.2.4.2.1

Raise $x$ to the power of $1$ .

$\frac{{(2 x + 3)}^{2} (6 (2 (x^{2} x^{1}) + 3 x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.4.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{{(2 x + 3)}^{2} (6 (2 x^{2 + 1} + 3 x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.4.3

Add $2$ and $1$ .

$\frac{{(2 x + 3)}^{2} (6 (2 x^{3} + 3 x^{2} + 4 x^{3} - 1))}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.2.5

Add $2 x^{3}$ and $4 x^{3}$ .

$\frac{{(2 x + 3)}^{2} \cdot 6 (6 x^{3} + 3 x^{2} - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$

Step 22.3

Move $6$ to the left of ${(2 x + 3)}^{2}$ .

$\frac{6 {(2 x + 3)}^{2} (6 x^{3} + 3 x^{2} - 1)}{{(4 x^{3} - 1)}^{\frac{1}{2}}}$