Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Continuity and Differentiability

Question:

$\underset{x→∞}{\lim}(\sqrt{x+\sqrt{x+\sqrt{x}}}-\sqrt{x})$ is given by

Options:

0

$\frac{1}{2}$

$\log 2$

none of these

Correct Answer:

$\frac{1}{2}$

Explanation:

$\underset{x→∞}{\lim}(\sqrt{x+\sqrt{x+\sqrt{x}}}-\sqrt{x})=\underset{x→∞}{\lim}\frac{\sqrt{x+\sqrt{x}}}{\sqrt{x+\sqrt{x+\sqrt{x}}}+\sqrt{x}}=\underset{x→∞}{\lim}\frac{\sqrt{1+x^{-1/2}}}{\sqrt{1+\sqrt{x^{-1}+x^{-3/2}}}+1}=\frac{1}{2}$