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9:32
Khan Academy
Limits by rationalizing
In this video, we explore how to find the limit of a function as x approaches -1. The function is (x+1)/(√(x+5)-2). To tackle the indeterminate form 0/0, we "rationalize the denominator" by multiplying the numerator and denominator by the conjugate of the denominator. This simplifies the expression, allowing us to evaluate the limit.
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