Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim9x4+7330x8−64x12Answer:
Identify highest power: Identify the highest power of x in the numerator and denominator.In the numerator, the highest power of x inside the cube root is x12, and in the denominator, the highest power of x is x4. To simplify the limit, we will factor out the highest power of x from both the numerator and the denominator.
Factor out x12: Factor out x12 from the cube root in the numerator and x4 from the denominator.The expression becomes:limx→∞(x4(9+7/x4)3x12(30/x4−64))
Simplify cube root: Simplify the cube root of x12 and cancel out x4.Since the cube root of x12 is x4, we can cancel out x4 from the numerator and denominator:limx→∞(330/x4−64x4)/(x4(9+7/x4))limx→∞(330/x4−641)/(9+7/x4)
Evaluate limit: Evaluate the limit as x approaches infinity.As x approaches infinity, the terms x430 and x47 approach 0. Therefore, the expression simplifies to:x→∞lim(3−641)/9x→∞lim(−41)/9
Simplify final expression: Simplify the final expression.The final expression simplifies to:(−4)1/9−361
More problems from Find derivatives of logarithmic functions