in Quantitative Aptitude
311 views
1 vote
1 vote

One root of $x^{2} + kx – 8 = 0$ is square of the other. Then, the value of k is:

  1. $2$ 
  2. $8$ 
  3. $-8$ 
  4. $-2$
in Quantitative Aptitude
7.9k points
311 views

1 Answer

2 votes
2 votes
Best answer

Let the roots of the quadratic equation be α and α2.

Product of roots = α*α2 = -8

α3 = -8

α = -2

Roots are -2 and 4 , now put the roots in given equation

42 + 4k - 8 = 0

k = -2

Option D is Correct.

selected by
2.7k points

Related questions

Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true