Rationalization
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When you're working with square roots, you can conjugate (a.k.a. rationalize) to solve for the limit!
A conjugate is an expression with two values and the sign in the middle flipped.
Scenario: Evaluate the limit of the below function at x = 16.
The numerator contains a square root, so let's take the conjugate of it...
Conjugate = √(x) + 4
...and then multiply the numerator and denominator by it!
