Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim7x4+6x323x+64x9Answer:
Identify Highest Power: To find the limit of the given function as x approaches infinity, we need to analyze the behavior of the numerator and the denominator separately. We look for the highest power of x in both the numerator and the denominator to simplify the expression.
Simplify by Dividing: In the numerator, the highest power of x inside the square root is x9, and in the denominator, the highest power of x is x4. To simplify, we can divide both the numerator and the denominator by x4, the highest power in the denominator.
Evaluate Terms: When we divide each term by x4, we get the following:Numerator: x423x+x464x9=x323+64x5Denominator: x47x4+x46x3=7+x6
Remove Terms Approaching Zero: As x approaches infinity, any term with x in the denominator will approach zero. Therefore, x323 approaches 0 and x6 approaches 0.
Final Simplification: After removing the terms that approach zero, we are left with:Numerator: 64x5Denominator: 7
Simplify Square Root: We can simplify the square root of 64x5 as 8x5/2, because 64 is 8 and x9 is x9/2.
Final Limit Calculation: Now we have the simplified form of the limit: limx→∞(78x5/2)
Limit Does Not Exist: Since x5/2 approaches infinity as x approaches infinity, the whole expression approaches infinity. Therefore, the limit does not exist (DNE).
More problems from Find limits of polynomials and rational functions