limxโ0lim๐ฅโ0x+29โโ29โx
Question
limxโ0lim๐ฅโ0x+29โโ29โx
Solution
The given expression is:
lim (xโ0) [x + โ29 - โ(29-x)]
To solve this limit, we can use the conjugate method. The conjugate of the expression inside the limit is [x + โ29 + โ(29-x)].
Step 1: Multiply and divide the expression by its conjugate:
lim (xโ0) [(x + โ29 - โ(29-x)) * (x + โ29 + โ(29-x))] / (x + โ29 + โ(29-x))
Step 2: Simplify the numerator using the difference of squares formula (a^2 - b^2 = (a-b)(a+b)):
lim (xโ0) [(x + โ29)^2 - (โ(29-x))^2] / (x + โ29 + โ(29-x))
Step 3: Simplify the numerator further:
lim (xโ0) [x + 58 + x - 29] / (x + โ29 + โ(29-x))
Step 4: Simplify the expression:
lim (xโ0) [2x + 29] / (x + โ29 + โ(29-x))
Step 5: As x approaches 0, the expression becomes:
[2*0 + 29] / (0 + โ29 + โ29)
Step 6: Simplify to get the final answer:
29 / (2โ29)
So, the limit of the given expression as x approaches 0 is 29 / (2โ29).
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