Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim9x+2x4+4x264x9+39x+39x8Answer:
Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim9x+2x4+4x264x9+39x+39x8Answer:
Identify highest power: We are given the limit: limx→∞(64x9+39x+39x8)/(9x+2x4+4x2)To simplify the limit, we will first identify the highest power of x in the numerator and the denominator.
Divide by x4: The highest power of x in the numerator inside the square root is x9, and the highest power of x in the denominator is x4. To simplify the expression, we will divide both the numerator and the denominator by x4.
Rewrite the limit: We rewrite the limit as: x→∞lim⎝⎛x49x+x42x4+x44x2x464x9+x439x+x439x8⎠⎞
Simplify terms: Simplify the terms inside the square root and the terms in the denominator: limx→∞(x39+2+x2464x5+x339+39x4)
Ignore negative powers: As x approaches infinity, the terms with negative powers of x will approach zero. Therefore, we can ignore x339 in the numerator and x39 and x24 in the denominator.limx→∞(264x5+39x4)
Take square root: Now, we can take the square root of the leading term in the numerator, which is 64x5, since the other term, 39x4, becomes negligible as x approaches infinity.x→∞lim(264x5)
Simplify expression: The square root of 64x5 is 8x25. So the limit simplifies to: limx→∞28x25
Divide by 2: Simplify the expression by dividing 8x25 by 2:limx→∞(4x25)
Limit is infinite: Since x5/2 grows without bound as x approaches infinity, the limit is infinite. Therefore, the limit does not exist (DNE).