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What is the nature of roots of the quadratic equation `4x^2-12 x-9=0` ?

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  12. Show that x=-2 is a solution of 3x^2+13 x+14=0

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  13. Find the discriminant of the quadratic equation 3sqrt3x^2+10x+sqrt3=0.

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  14. If x=(-1)/2 , is a solution of the quadratic equation 3x^2+2k x-3=0...

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  15. If the equation x^2+4x+k=0 has real and distinct roots, then (a)...

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  16. If the equation 9x^2+6k x+4=0 has equal roots, then the roots are ...

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  17. If the equation a x^2+2x+a=0 has two distinct roots, if (a)a=+-1...

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  18. If 2 is a root of the equation x^2+b x+12=0 and the equation x^2+b...

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