Q. Find the limit as x approaches negative infinity.x→−∞lim16x2−9x3x=
Identify highest power of x: Identify the highest power of x in the denominator.In the expression 16x2−9x, the highest power of x is x2 inside the square root. This means that the square root behaves like x2 for large values of x.
Factor out highest power of x: Factor out the highest power of x from the square root in the denominator.We can write 16x2−9x as x2(16−x9). For large values of x, the term x9 approaches 0, so we can approximate the expression as 16x2.
Simplify expression by dividing: Simplify the expression by dividing both the numerator and the denominator by x. We get 16x23x=4∣x∣3x. Since we are considering the limit as x approaches negative infinity, ∣x∣ is equal to −x. Therefore, the expression simplifies to 4(−x)3x.
Simplify expression further: Simplify the expression further.The x's cancel out, and we are left with −43, since there is a negative sign from the ∣x∣ when x is negative.
Conclude the limit: Conclude the limit.The limit of the expression as x approaches negative infinity is −43.
More problems from Powers with decimal and fractional bases