Solution: Quotient Rule #2

Solution: Quotient Rule #2

Find the derivative of:

[latex]\Large{y = \frac{x^2-3x+1}{2x^2+5}}[/latex]

Step 1:

 

We notice that the given function is a quotient of two other functions. To find the derivative of this, we can use the quotient rule. First, let’s label the two functions as:

 

[latex]\large{f(x) = x^2-3x+1}[/latex] and [latex]\large{g(x) = 2x^2+5}[/latex]

To use the quotient rule, we also need the derivative of these functions. We can easily find the derivatives as:

 

[latex]\large{f'(x) = 2x-3}[/latex] and [latex]\large{g'(x) = 4x}[/latex]

 

Step 2:

 

The quotient rule formula states that:

 

[latex]\large{\frac{d}{dx}\frac{f(x)}{g(x)} = \frac{g(x)f'(x) – f(x)g'(x)}{g(x)^2}}[/latex]

 

Thus, substituting into the quotient rule formula, we have:

 

[latex]\large{\frac{d}{dx}(\frac{x^2-3x+1}{2x^2+5}) = \frac{(2x^2+5)(2x-3) \:- \:(x^2-3x+1)(4x)}{(2x^2+5)^2}}[/latex]

 

Step 3:

 

Simplifying, we have:

 

[latex]\Large{ = \frac{4x^3-6x^2+10x-15-4x^3+12x^2-4x}{(2x^2+5)^2}}[/latex]

 

[latex]\Large{ = \frac{6x^2+6x-15}{(2x^2+5)^2}}[/latex]

 

Thus, this is the final answer for the derivative. So:

 

[latex]\Large{\frac{dy}{dx} = \frac{6x^2+6x-15}{(2x^2+5)^2}}[/latex]

 

Solution Complete!

 

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Solution: Quotient Rule #2

Find the derivative of:

[latex]\Large{y = \frac{x^2-3x+1}{2x^2+5}}[/latex]

Step 1:

 

We notice that the given function is a quotient of two other functions. To find the derivative of this, we can use the quotient rule. First, let’s label the two functions as:

 

[latex]\large{f(x) = x^2-3x+1}[/latex] and [latex]\large{g(x) = 2x^2+5}[/latex]

 

To use the quotient rule, we also need the derivative of these functions. We can easily find the derivatives as:

 

[latex]\large{f'(x) = 2x-3}[/latex] and [latex]\large{g'(x) = 4x}[/latex]

 

Step 2:

 

The quotient rule formula states that:

 

[latex]\large{\frac{d}{dx}\frac{f(x)}{g(x)} = \frac{g(x)f'(x) – f(x)g'(x)}{g(x)^2}}[/latex]

 

Thus, substituting into the quotient rule formula, we have:

 

[latex]\large{\frac{d}{dx}(\frac{x^2-3x+1}{2x^2+5})}[/latex]

 

[latex]\large{ = \frac{(2x^2+5)(2x-3) \:- \:(x^2-3x+1)(4x)}{(2x^2+5)^2}}[/latex]

 

 

Step 3:

 

Simplifying, we have:

 

[latex]\Large{ = \frac{4x^3-6x^2+10x-15-4x^3+12x^2-4x}{(2x^2+5)^2}}[/latex]

 

[latex]\Large{ = \frac{6x^2+6x-15}{(2x^2+5)^2}}[/latex]

 

Thus, this is the final answer for the derivative. So:

 

[latex]\Large{\frac{dy}{dx} = \frac{6x^2+6x-15}{(2x^2+5)^2}}[/latex]

 

Solution Complete!

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