a value of b for which the eq. x^2 + bx -1=0 x^2 +x +b =0 have one common root

a value of b for which the eq.

                x^2 + bx -1=0

                x^2 +x +b =0

have one common root


1 Answers

jitender lakhanpal
62 Points
10 years ago

hi taru

  Let the two quadratic equations be  ax² + bx + c =0 and a1x² + b1x + c1 =0 .

then the condition that one of the root is common

(bc1-b1c)(ab1- a1b) = (ca1-ac1) 2

compare with the given equations  find the value of a , a1 , b , b1 , c , c1


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