Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Relations and Functions

Question:

If $(\sqrt{2})^x+(\sqrt{3})^x=(\sqrt{13})^{x/2}$, then the number of real values of x is _____.

Correct Answer:
1
Explanation:

We have,

$(\sqrt{2})^x+(\sqrt{3})^x=(\sqrt{13})^{x/2}$

$⇒2^{x/2}+3^{x/2}=(\sqrt{13})^{x/2}$

$⇒(\frac{2}{\sqrt{13}})^{x/2}+(\frac{3}{\sqrt{13}})^{x/2}=(\frac{2}{\sqrt{13}})^{2}+(\frac{3}{\sqrt{13}})^2$

$⇒\frac{x}{2}=2$   [On comparison]

$⇒x=4$