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Popular >

derivative of f(x)=(4x-1)/(x+5)

Solution

derivative of

f (x) = \frac{4 x - 1}{x + 5}

Solution

\frac{21}{( x + 5 ) ^{2}}

Solution steps

\frac{d}{d x} (\frac{4 x - 1}{x + 5})

Apply the Quotient Rule:

(\frac{f}{g})^{'} = \frac{f ^{'} \cdot g - g ^{'} \cdot f}{g ^{2}}

= \frac{\frac{d}{d x} ( 4 x - 1 ) ( x + 5 ) - \frac{d}{d x} ( x + 5 ) ( 4 x - 1 )}{( x + 5 ) ^{2}}

\frac{d}{d x} (4 x - 1) = 4

\frac{d}{d x} (x + 5) = 1

= \frac{4 ( x + 5 ) - 1 \cdot ( 4 x - 1 )}{( x + 5 ) ^{2}}

Simplify

\frac{4 ( x + 5 ) - 1 \cdot ( 4 x - 1 )}{( x + 5 ) ^{2}} : \frac{21}{( x + 5 ) ^{2}}

= \frac{21}{( x + 5 ) ^{2}}

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Frequently Asked Questions (FAQ)

What is the derivative of f(x)=(4x-1)/(x+5) ?
The derivative of f(x)=(4x-1)/(x+5) is (21)/((x+5)^2)
What is the first derivative of f(x)=(4x-1)/(x+5) ?
The first derivative of f(x)=(4x-1)/(x+5) is (21)/((x+5)^2)