12. If x4 is one of the roots of the quadraticequation kx2 + 5x-12 0, – InterviewSolution

1.

12. If x4 is one of the roots of the quadraticequation kx2 + 5x-12 0, find the value of k.

Answer»

= Substituting x = -4 in the equation.

= k (-4)^2 + 5 ( -4 ) - 12 = 0

= 16 k - 20 - 12 = 0

= 16 k - 32 = 0

= 16 k = 32

= k = 2.

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