Find the Derivative - d/dx (42^x)/(6^x)

$\frac{42^{x}}{6^{x}}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = 42^{x}$ and $g (x) = 6^{x}$ .

$\frac{6^{x} \frac{d}{d x} [42^{x}] - 42^{x} \frac{d}{d x} [6^{x}]}{{(6^{x})}^{2}}$

Step 2

Multiply the exponents in ${(6^{x})}^{2}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{6^{x} \frac{d}{d x} [42^{x}] - 42^{x} \frac{d}{d x} [6^{x}]}{6^{x \cdot 2}}$

Move $2$ to the left of $x$ .

$\frac{6^{x} \frac{d}{d x} [42^{x}] - 42^{x} \frac{d}{d x} [6^{x}]}{6^{2 x}}$

Step 3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $42$ .

$\frac{6^{x} (42^{x} \ln (42)) - 42^{x} \frac{d}{d x} [6^{x}]}{6^{2 x}}$

Step 4

Simplify with factoring out.

Rewrite $42^{x} \cdot 6^{x}$ as ${(42 \cdot 6)}^{x}$ .

$\frac{{(42 \cdot 6)}^{x} \ln (42) - 42^{x} \frac{d}{d x} [6^{x}]}{6^{2 x}}$

Multiply $42$ by $6$ .

$\frac{252^{x} \ln (42) - 42^{x} \frac{d}{d x} [6^{x}]}{6^{2 x}}$

Step 5

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $6$ .

$\frac{252^{x} \ln (42) - 42^{x} (6^{x} \ln (6))}{6^{2 x}}$

Step 6

Simplify with factoring out.

Rewrite $6^{x} \cdot 42^{x}$ as ${(6 \cdot 42)}^{x}$ .

$\frac{252^{x} \ln (42) - {(6 \cdot 42)}^{x} \ln (6)}{6^{2 x}}$

Multiply $6$ by $42$ .

$\frac{252^{x} \ln (42) - 252^{x} \ln (6)}{6^{2 x}}$

Step 7

Simplify the numerator.

Factor $252^{x}$ out of $252^{x} \ln (42) - 252^{x} \ln (6)$ .

Factor $252^{x}$ out of $252^{x} \ln (42)$ .

$\frac{252^{x} (\ln (42)) - 252^{x} \ln (6)}{6^{2 x}}$

Factor $252^{x}$ out of $- 252^{x} \ln (6)$ .

$\frac{252^{x} (\ln (42)) + 252^{x} (- \ln (6))}{6^{2 x}}$

Factor $252^{x}$ out of $252^{x} (\ln (42)) + 252^{x} (- \ln (6))$ .

$\frac{252^{x} (\ln (42) - \ln (6))}{6^{2 x}}$

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\frac{252^{x} \ln (\frac{42}{6})}{6^{2 x}}$

Divide $42$ by $6$ .

$\frac{252^{x} \ln (7)}{6^{2 x}}$

Find the Derivative - d/dx (42^x)/(6^x)

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