A value of for which the equations and have one root in common is

MATHEMATICS · Single correct · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

A value of

b

for which the equations

x^2+bx-1=0

and

x^2+x+b=0

have one root in common is (1)

-\sqrt{2}

(2)

-i\sqrt{3}

, where

i=\sqrt{-1}

(3)

i\sqrt{5}

, where

i=\sqrt{-1}

(4)

\sqrt{2}