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What is the positive value of k if difference of roots of the quadratic equation x2 – kx + 12 = 0 is 1?
A. -7
B. 7
C. 4
D. 8

This question is part of Quadratic Equations
Asked by Jagran josh, Last updated: May 23, 2020

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3 Answers

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Answered Oct 12, 2017

-7,because it has been verified also:

x2-(-7)x + 12=0

x2+7x +12=0

x2+4x +3x +12=0

x(x+4)+3(x+4)=0

(x+3)(x+4)=0

now,difference= -3-(-4)= -3+4=1

hence,verified

1
 

John Adney

John Adney

Answered Oct 12, 2017

-7,because it has been verified also:

x2-(-7)x + 12=0

x2+7x +12=0

x2+4x +3x +12=0

x(x+4)+3(x+4)=0

(x+3)(x+4)=0

now,difference= -3-(-4)= -3+4=1

hence,verified

 

jagran josh

Jagran josh

Answered Sep 16, 2017

7
1
 

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