Calculus Examples

Find the Tangent Line at x=5 f(x) = square root of x^2+24 , x=5
,
Step 1
Find the corresponding -value to .
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Step 1.1
Substitute in for .
Step 1.2
Simplify .
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Step 1.2.1
Raise to the power of .
Step 1.2.2
Add and .
Step 1.2.3
Rewrite as .
Step 1.2.4
Pull terms out from under the radical, assuming positive real numbers.
Step 2
Find the first derivative and evaluate at and to find the slope of the tangent line.
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Step 2.1
Use to rewrite as .
Step 2.2
Differentiate using the chain rule, which states that is where and .
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Step 2.2.1
To apply the Chain Rule, set as .
Step 2.2.2
Differentiate using the Power Rule which states that is where .
Step 2.2.3
Replace all occurrences of with .
Step 2.3
To write as a fraction with a common denominator, multiply by .
Step 2.4
Combine and .
Step 2.5
Combine the numerators over the common denominator.
Step 2.6
Simplify the numerator.
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Step 2.6.1
Multiply by .
Step 2.6.2
Subtract from .
Step 2.7
Combine fractions.
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Step 2.7.1
Move the negative in front of the fraction.
Step 2.7.2
Combine and .
Step 2.7.3
Move to the denominator using the negative exponent rule .
Step 2.8
By the Sum Rule, the derivative of with respect to is .
Step 2.9
Differentiate using the Power Rule which states that is where .
Step 2.10
Since is constant with respect to , the derivative of with respect to is .
Step 2.11
Simplify terms.
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Step 2.11.1
Add and .
Step 2.11.2
Combine and .
Step 2.11.3
Combine and .
Step 2.11.4
Cancel the common factor.
Step 2.11.5
Rewrite the expression.
Step 2.12
Evaluate the derivative at .
Step 2.13
Simplify the denominator.
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Step 2.13.1
Raise to the power of .
Step 2.13.2
Add and .
Step 2.13.3
Rewrite as .
Step 2.13.4
Apply the power rule and multiply exponents, .
Step 2.13.5
Cancel the common factor of .
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Step 2.13.5.1
Cancel the common factor.
Step 2.13.5.2
Rewrite the expression.
Step 2.13.6
Evaluate the exponent.
Step 3
Plug the slope and point values into the point-slope formula and solve for .
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Step 3.1
Use the slope and a given point to substitute for and in the point-slope form , which is derived from the slope equation .
Step 3.2
Simplify the equation and keep it in point-slope form.
Step 3.3
Solve for .
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Step 3.3.1
Simplify .
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Step 3.3.1.1
Rewrite.
Step 3.3.1.2
Simplify by adding zeros.
Step 3.3.1.3
Apply the distributive property.
Step 3.3.1.4
Combine and .
Step 3.3.1.5
Multiply .
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Step 3.3.1.5.1
Combine and .
Step 3.3.1.5.2
Multiply by .
Step 3.3.1.6
Move the negative in front of the fraction.
Step 3.3.2
Move all terms not containing to the right side of the equation.
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Step 3.3.2.1
Add to both sides of the equation.
Step 3.3.2.2
To write as a fraction with a common denominator, multiply by .
Step 3.3.2.3
Combine and .
Step 3.3.2.4
Combine the numerators over the common denominator.
Step 3.3.2.5
Simplify the numerator.
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Step 3.3.2.5.1
Multiply by .
Step 3.3.2.5.2
Add and .
Step 3.3.3
Reorder terms.
Step 4