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If the equation (a^2+b^2)x^2-2(ac+bd)x+(...

If the equation `(a^2+b^2)x^2-2(ac+bd)x+(c^2+d^2)=0` has equal roots, then

A

ad=bc

B

ab=cd

C

`ab=sqrt(bc)`

D

`ab=sqrt(cd)`

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R G PUBLICATION-QUADRATIC EQUATIONS-EXERCISE
  1. The quadratic equation is a)x(x+1)+8=(x+2)(x-2) b)x^2+1/x^2=5 c)x^2...

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  2. The roots of the quadratic equation x^2+6x+5=0 a)5,-1 b)2,3 c)6,-1 ...

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  3. If ax^2+bx+c=0has equal roots,then,c= a)b/(2a) b)-b/(2a) c)b^2/(4a) d...

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  4. If x^2-4x+p=0has real roots then

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  5. The roots of the equation x^2-sqrt3x-x+sqrt3=0 are

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  6. The roots of the equation ax^2+x+b=0 are equal if

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  7. If x=1 is a common root of equations ax^2+ax+3=0 and x^2+x+b=0then ab=

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  8. The equation ax^2+2x+a=0 has two distinct roots,if

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  9. If x^2+2(k+2)x+9k=0 has equal roots then k= a)-1,4 b)1,-4 c)-1,-4 ...

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  10. If 8 is a root of the equation x^2-10x+k=0then the value of k is a)1...

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  11. If a and b are the roots of the equation x^2+ax+b=0,then a+b=

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  12. If one root of the equation x^2+ax+3=0 is 1,then its other root is ...

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  13. The positive value of k for which the equation x^2+kx+64=0 and x^2-8x+...

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  14. The roots of the equation sqrt2x^2+5x+2sqrt2=0 are a)Rational b)Irr...

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  15. The value Of sqrt(6+sqrt(6+sqrt(6+.....))) is a)-2 b)3.5 c)3 d)4

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  16. For the quadratic equation x^2-2x+1=0 the value of x+1/x is a)1 b)-...

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  17. If the equation (a^2+b^2)x^2-2(ac+bd)x+(c^2+d^2)=0 has equal roots, th...

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  18. If (a^2+b^2)x^2+2(ac+bd)x+(c^2+d^2)=0 has no real roots then

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  19. The roots of the equation ax^2+bx+c=0will be reciprocal of each other ...

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  20. The roots of the equation ax^2+bx+c=0 will be equal in magnitute but o...

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