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Find the limit as 
x approaches negative infinity.

lim_(x rarr-oo)(3x)/(sqrt(16x^(2)-9x))=

Find the limit as x x approaches negative infinity.\newlinelimx3x16x29x= \lim _{x \rightarrow-\infty} \frac{3 x}{\sqrt{16 x^{2}-9 x}}=

Full solution

Q. Find the limit as x x approaches negative infinity.\newlinelimx3x16x29x= \lim _{x \rightarrow-\infty} \frac{3 x}{\sqrt{16 x^{2}-9 x}}=
  1. Identify highest power of x: Identify the highest power of x in the denominator.\newlineIn the expression 16x29x\sqrt{16x^2-9x}, the highest power of x is x2x^2 inside the square root. This means that the square root behaves like x2\sqrt{x^2} for large values of x.
  2. Factor out highest power of x: Factor out the highest power of xx from the square root in the denominator.\newlineWe can write 16x29x\sqrt{16x^2-9x} as x2(169x)\sqrt{x^2(16-\frac{9}{x})}. For large values of xx, the term 9x\frac{9}{x} approaches 00, so we can approximate the expression as 16x2\sqrt{16x^2}.
  3. Simplify expression by dividing: Simplify the expression by dividing both the numerator and the denominator by xx. We get 3x16x2=3x4x\frac{3x}{\sqrt{16x^2}} = \frac{3x}{4|x|}. Since we are considering the limit as xx approaches negative infinity, x|x| is equal to x-x. Therefore, the expression simplifies to 3x4(x)\frac{3x}{4(-x)}.
  4. Simplify expression further: Simplify the expression further.\newlineThe xx's cancel out, and we are left with 34-\frac{3}{4}, since there is a negative sign from the x|x| when xx is negative.
  5. Conclude the limit: Conclude the limit.\newlineThe limit of the expression as xx approaches negative infinity is 34-\frac{3}{4}.