Calculus Examples

Find the Horizontal Tangent Line y=x square root of x
Step 1
Set as a function of .
Step 2
Find the derivative.
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Step 2.1
Use to rewrite as .
Step 2.2
Multiply by by adding the exponents.
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Step 2.2.1
Multiply by .
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Step 2.2.1.1
Raise to the power of .
Step 2.2.1.2
Use the power rule to combine exponents.
Step 2.2.2
Write as a fraction with a common denominator.
Step 2.2.3
Combine the numerators over the common denominator.
Step 2.2.4
Add and .
Step 2.3
Differentiate using the Power Rule which states that is where .
Step 2.4
To write as a fraction with a common denominator, multiply by .
Step 2.5
Combine and .
Step 2.6
Combine the numerators over the common denominator.
Step 2.7
Simplify the numerator.
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Step 2.7.1
Multiply by .
Step 2.7.2
Subtract from .
Step 2.8
Combine and .
Step 3
Set the derivative equal to then solve the equation .
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Step 3.1
Set the numerator equal to zero.
Step 3.2
Solve the equation for .
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Step 3.2.1
Divide each term in by and simplify.
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Step 3.2.1.1
Divide each term in by .
Step 3.2.1.2
Simplify the left side.
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Step 3.2.1.2.1
Cancel the common factor.
Step 3.2.1.2.2
Divide by .
Step 3.2.1.3
Simplify the right side.
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Step 3.2.1.3.1
Divide by .
Step 3.2.2
Raise each side of the equation to the power of to eliminate the fractional exponent on the left side.
Step 3.2.3
Simplify the exponent.
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Step 3.2.3.1
Simplify the left side.
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Step 3.2.3.1.1
Simplify .
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Step 3.2.3.1.1.1
Multiply the exponents in .
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Step 3.2.3.1.1.1.1
Apply the power rule and multiply exponents, .
Step 3.2.3.1.1.1.2
Cancel the common factor of .
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Step 3.2.3.1.1.1.2.1
Cancel the common factor.
Step 3.2.3.1.1.1.2.2
Rewrite the expression.
Step 3.2.3.1.1.2
Simplify.
Step 3.2.3.2
Simplify the right side.
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Step 3.2.3.2.1
Raising to any positive power yields .
Step 4
Solve the original function at .
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Step 4.1
Replace the variable with in the expression.
Step 4.2
Simplify the result.
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Step 4.2.1
Remove parentheses.
Step 4.2.2
Rewrite as .
Step 4.2.3
Pull terms out from under the radical, assuming positive real numbers.
Step 4.2.4
Multiply by .
Step 4.2.5
The final answer is .
Step 5
The horizontal tangent line on function is .
Step 6