Derivative of (14x^2)/sqrt(1-x) | Homework Help & Explanation

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In summary, the formula for finding the derivative of a function is given by f'(x) = lim(h->0) ((f(x+h) - f(x))/h). For the given function of (14x^2)/sqrt(1-x), the quotient rule can be used to find the derivative. The domain of the function is (-∞, 1) U (1, ∞). Before finding the derivative, the function can be simplified by combining like terms and using algebraic rules. The chain rule can also be used to find the derivative of this function. There are specific methods, such as the quotient rule, product rule, and chain rule, for finding the derivative of a rational function. Simplifying the function
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Cacophony
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Homework Statement



derivative of: (14x^2)/sqrt(1-x)

Homework Equations





The Attempt at a Solution



I am at this point at finding the derivative:

(28x(sqrt(1-x))+((7x^2)/sqrt(1-x))/(1-x)

I am confused about the next step because don't know how it's derived from the previous attempt:

Final solution: (28x-21x^2)/(1-x)^3/2

How is this derived?
 
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  • #2
for your equation above it should be 28x/sqrt(1-x) + 7x^2/(1-x)^3/2 then go from there..
 

1. What is the formula for finding the derivative of (14x^2)/sqrt(1-x)?

The formula for finding the derivative of a function is given by:
f'(x) = lim(h->0) ((f(x+h) - f(x))/h)
In the case of (14x^2)/sqrt(1-x), we can use the quotient rule to find the derivative, which is:
f'(x) = (14x(sqrt(1-x)) - (14x^2)(-1/2)(1-x)^(-3/2)) / (1-x)

2. What is the domain of the given function?

The given function is defined for all real numbers except x=1, as dividing by 0 is undefined. Therefore, the domain of the function is (-∞, 1) U (1, ∞).

3. How do I simplify the given function before finding the derivative?

Before finding the derivative, you can simplify the given function by combining like terms and using algebraic rules such as the product and quotient rules. In this case, you can distribute the 14x^2 term and combine it with the (14x^2)(-1/2) term, and then factor out the (1-x)^(-3/2) term. This will result in a simpler function that is easier to differentiate.

4. Can I use the chain rule to find the derivative of this function?

Yes, you can use the chain rule to find the derivative of this function. The chain rule states that if a function is composed of two or more functions, then the derivative is equal to the derivative of the outer function multiplied by the derivative of the inner function. In this case, the outer function is f(x) = 14x^2 and the inner function is g(x) = sqrt(1-x). Therefore, the derivative of the given function can be rewritten as:
f'(x) = (f(g(x))/g(x)) * g'(x)

5. Is there a specific method for finding the derivative of a rational function?

Yes, there are specific rules and formulas for finding the derivative of a rational function. The most commonly used methods are the quotient rule, product rule, and chain rule. It is important to understand and recognize which rule to apply when finding the derivative of a rational function. In some cases, simplifying the function before differentiating can also make the process easier.

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