edited by
486 views
0 0 votes

The roots $\alpha, \beta$ of the equation $3 x^{2}+\lambda x-1=0$, satisfy $\frac{1}{\alpha^{2}}+\frac{1}{\beta^{2}}=15$. The value of $\left(\alpha^{3}+\beta^{3}\right)^{2}$, is

  1. $1$
  2. $4$
  3. $9$
  4. $16$

Please log in or register to answer this question.

Related questions

0 0 votes
0 0 answers
479
479 views
Shubham Sharma 2 asked Jun 26, 2025
479 views
A function $f$ maps the set of natural numbers to whole numbers, such that $f(x y)=f(x) f(y)+f(x)+f(y)$ for all $x, y$ and $f(p)=1$ for every prime number $p$. Then, the ...
0 0 votes
0 0 answers
482
482 views
Shubham Sharma 2 asked Jun 26, 2025
482 views
If $a, b$ and $c$ are positive real numbers such that $a>10 \geq b \geq c$ and $\frac{\log _{8}(a+b)}{\log _{2} c}+\frac{\log _{27}(a-b)}{\log _{3} c}=\frac{2}{3}$, then ...
0 0 votes
0 0 answers
504
504 views
Shubham Sharma 2 asked Jun 26, 2025
504 views
If $x$ and $y$ are real numbers such that $4 x^{2}+4 y^{2}-4 x y-6 y+3=0$, then the value of $(4 x+5 y)$ is
0 0 votes
0 0 answers
580
580 views
Shubham Sharma 2 asked Jun 26, 2025
580 views
Three circles of equal radii touch (but not cross) each other externally. Two other circles, $X$ and $Y$, are drawn such that both touch (but not cross) each of the three...
0 0 votes
0 0 answers
514
514 views
Shubham Sharma 2 asked Jun 26, 2025
514 views
The sum of the infinite series $\frac{1}{5}\left(\frac{1}{5}-\frac{1}{7}\right)+\left(\frac{1}{5}\right)^{2}\left(\left(\frac{1}{5}\right)^{2}-\left(\frac{1}{7}\right)^{2...