Q. Find the limit as x approaches negative infinity.x→−∞limx10+8x7x5+4x2=
Analyze Function and Limit: Analyze the given function and the limit to be found.We need to find the limit of the function (x5+4x2)/(x10+8x7) as x approaches negative infinity. To do this, we will look for the dominant terms in the numerator and the denominator.
Identify Dominant Terms: Identify the dominant terms in the numerator and the denominator.In the numerator, the dominant term is x5 because it has the highest power of x. In the denominator, the dominant term inside the square root is x10, which is the highest power of x there.
Simplify by Dividing: Simplify the function by dividing the numerator and the denominator by x5. We divide each term in the numerator and the square root of each term in the denominator by x5 to simplify the expression. This gives us:limx→−∞x10/x5+8x7/x5x5/x5+4x2/x5Simplifying further, we get:limx→−∞x5+8x21+4/x3
Evaluate Limit: Evaluate the limit of the simplified function as x approaches negative infinity.As x approaches negative infinity, the terms x34 and x58x2 in the simplified function will approach 0 because they have x in the denominator with a positive power. This leaves us with:limx→−∞x51Since x is approaching negative infinity, we need to consider the behavior of x5. The square root function is not defined for negative numbers, but since we are dealing with x5, which is an odd power, the result will be negative and the square root of a negative number is not a real number. This indicates that we have made a mistake in our simplification process because we cannot take the square root of a negative number.
More problems from Powers with decimal and fractional bases