Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞limx4+4x23−50x6+4+27x12Answer:
Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞limx4+4x23−50x6+4+27x12Answer:
Observe Highest Powers: To find the limit of the given expression as x approaches infinity, we first observe the highest powers of x in the numerator and the denominator. In the numerator, the highest power is x12 inside the cube root, which simplifies to x4 outside the cube root. In the denominator, the highest power is x4. We will divide both the numerator and the denominator by x4 to simplify the expression.
Divide by x4: Divide each term in the numerator and the denominator by x4:x→∞lim(3x4−50x6+x44+x427x12)/(x4x4+x44x2)Simplify the expression:x→∞lim(3−50x2+x44+27x8)/(1+x24)
Simplify Expression: As x approaches infinity, the terms with negative powers of x will approach zero. Therefore, x44 in the numerator and x24 in the denominator will become negligible:limx→∞(3−50x2+0+27x8)/(1+0)Simplify the expression further:limx→∞(327x8−50x2)/1
Approaching Infinity: Now, we can take the cube root of the terms inside the root separately since the limit of a sum is the sum of the limits:limx→∞(327x8−350x2)Simplify the cube roots:limx→∞(3x38−(50)31x32)
Take Cube Roots: As x approaches infinity, the term with the higher power of x will dominate. In this case, 3x8/3 will grow much faster than (50)1/3x2/3, so the latter term becomes negligible:limx→∞(3x8/3)
Dominant Term: The limit of 3x38 as x approaches infinity is infinity since the power of x is positive:x→∞lim(3x38)=∞Therefore, the limit does not exist (DNE).
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