Calculus Examples

Find the Tangent Line at the Point y = square root of x , (9,3)
,
Step 1
Find the first derivative and evaluate at and to find the slope of the tangent line.
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Step 1.1
Use to rewrite as .
Step 1.2
Differentiate using the Power Rule which states that is where .
Step 1.3
To write as a fraction with a common denominator, multiply by .
Step 1.4
Combine and .
Step 1.5
Combine the numerators over the common denominator.
Step 1.6
Simplify the numerator.
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Step 1.6.1
Multiply by .
Step 1.6.2
Subtract from .
Step 1.7
Move the negative in front of the fraction.
Step 1.8
Simplify.
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Step 1.8.1
Rewrite the expression using the negative exponent rule .
Step 1.8.2
Multiply by .
Step 1.9
Evaluate the derivative at .
Step 1.10
Simplify.
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Step 1.10.1
Simplify the denominator.
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Step 1.10.1.1
Rewrite as .
Step 1.10.1.2
Apply the power rule and multiply exponents, .
Step 1.10.1.3
Cancel the common factor of .
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Step 1.10.1.3.1
Cancel the common factor.
Step 1.10.1.3.2
Rewrite the expression.
Step 1.10.1.4
Evaluate the exponent.
Step 1.10.2
Multiply by .
Step 2
Plug the slope and point values into the point-slope formula and solve for .
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Step 2.1
Use the slope and a given point to substitute for and in the point-slope form , which is derived from the slope equation .
Step 2.2
Simplify the equation and keep it in point-slope form.
Step 2.3
Solve for .
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Step 2.3.1
Simplify .
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Step 2.3.1.1
Rewrite.
Step 2.3.1.2
Simplify by adding zeros.
Step 2.3.1.3
Apply the distributive property.
Step 2.3.1.4
Combine and .
Step 2.3.1.5
Cancel the common factor of .
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Step 2.3.1.5.1
Factor out of .
Step 2.3.1.5.2
Factor out of .
Step 2.3.1.5.3
Cancel the common factor.
Step 2.3.1.5.4
Rewrite the expression.
Step 2.3.1.6
Combine and .
Step 2.3.1.7
Move the negative in front of the fraction.
Step 2.3.2
Move all terms not containing to the right side of the equation.
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Step 2.3.2.1
Add to both sides of the equation.
Step 2.3.2.2
To write as a fraction with a common denominator, multiply by .
Step 2.3.2.3
Combine and .
Step 2.3.2.4
Combine the numerators over the common denominator.
Step 2.3.2.5
Simplify the numerator.
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Step 2.3.2.5.1
Multiply by .
Step 2.3.2.5.2
Add and .
Step 2.3.3
Reorder terms.
Step 3