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High School Math : Finding Derivatives

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Example Question #1 : Understanding Derivatives Of Sums, Quotients, And Products

What is the first derivative of $5x^4+\sin x$ ?

Possible Answers:

$20x^3+4\cos x$

$20x^3+\frac{1}{\sin x}$

$5x^4\cos x +20x^3\sin x$

$20x^{3}+\cos x$

$20x^{3}-\cos x$

Correct answer:

$20x^{3}+\cos x$

Explanation:

Since we're adding terms, we take the derivative of each part separately. For 5x^4 , we can use the power rule, which states that we multiply the variable by the current exponent and then lower the exponent by one. For sine, we use our trigonometric derivative rules.

Remember, $\frac{\mathrm{d} }{\mathrm{d} x} \sin x=\cos x$ .

$\frac{\mathrm{d} }{\mathrm{d} x}5x^4+\sin x=(4*5x^{4-1})+\cos x$

$\frac{\mathrm{d} }{\mathrm{d} x}5x^4+\sin x=(20x^{3})+\cos x$

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Example Question #2 : Understanding Derivatives Of Sums, Quotients, And Products

What is the second derivative of $5x^4+\sin x$ ?

Possible Answers:

$40x^2-\cos x$

$40x^{2}-\sin x$

$60x^{2}-\sin x$

$x^5-\csc x$

$120x+\sin x$

Correct answer:

$60x^{2}-\sin x$

Explanation:

To find the second derivative, we need to start by finding the first one.

Remember, $\frac{\mathrm{d} }{\mathrm{d} x} \sin x=\cos x$ .

$\frac{\mathrm{d} }{\mathrm{d} x}5x^4+\sin x=(4*5x^{4-1})+\cos x$

$\frac{\mathrm{d} }{\mathrm{d} x}5x^4+\sin x=(20x^{3})+\cos x$

Now we repeat the process, but using $20x^3+\cos x$ as our equation.

$\frac{\mathrm{d} }{\mathrm{d} x} \cos x=-\sin x$

$\frac{\mathrm{d} }{\mathrm{d} x}20x^3+\cos x=(3*20x^{3-1})-\sin x$

$\frac{\mathrm{d} }{\mathrm{d} x}20x^3+\cos x=(60x^{2})-\sin x$

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Example Question #1 : Understanding The Derivative Of A Sum, Product, Or Quotient

Which of the following best represents $\frac{\mathrm{d} }{\mathrm{d} x}\frac{f(x)}{g(x)}$ ?

Possible Answers:

$\frac{f(x)g'(x)-g(x)f'(x)}{g(x)^2}$

$\frac{g(x)f'(x)-f(x)g'(x)}{g(x)^2}$

$\frac{g(x)g'(x)-f(x)f'(x)}{g(x)^2}$

f'(x)g(x)+g'(x)f(x)

$\frac{f'(x)}{g'(x)}$

Correct answer:

$\frac{g(x)f'(x)-f(x)g'(x)}{g(x)^2}$

Explanation:

The question is just asking for the Quotient Rule formula.

Recall the Quotient Rule is the bottom function times the derivative of the top minus the top function times the derivative of the bottom all divided by the bottom function squared.

Given,

$\frac{\mathrm{d} }{\mathrm{d} x}\frac{f(x)}{g(x)}$

the bottom function is g(x) and the top function is f(x) . This makes the bottom derivative g'(x) and the top derivative f'(x) .

Substituting these into the Quotient Rule formula resulting in the following.

$\frac{\mathrm{d} }{\mathrm{d} x}\frac{f(x)}{g(x)}=\frac{g(x)\cdot f'(x)-f(x)\cdot g'(x)}{(g(x))^2}$

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High School Math : Finding Derivatives

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #1 : Understanding Derivatives Of Sums, Quotients, And Products

Example Question #2 : Understanding Derivatives Of Sums, Quotients, And Products

Example Question #1 : Understanding The Derivative Of A Sum, Product, Or Quotient

All High School Math Resources

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