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If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 repres...

If `ax^(2)+2hxy+by^(2)+2gx+2fy+c=0` represents parallel straight lines, then

A

`abc+2gfh-af^(2)-bg^(2)-ch^(2)=0`

B

`h^(2)-ab=0`

C

`h^(2)gtab`

D

`h^(2)ltab`

Text Solution

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The correct Answer is:
A
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NIKITA PUBLICATION-PAIR OF STRAIGHT LINES-MULTIPLE CHOICE QUESTIONS
  1. The lines represents by ax^2+2hxy+by^2=0 are perpendicular to each oth...

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  2. The product of perpendiculars let fall from the point (x(1),y(1)) upon...

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  3. If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents parallel straight lines, ...

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  4. If the equation ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents a pair of pa...

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  5. If the equation ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents a pair of pa...

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  6. Lines represented by 4x^(2)+4xy+y^(2)=0 are

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  7. Lines represented by x^(2)-y^(2)=0 are

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  8. Lines represented by x^(2)+7xy+2y^(2)=0 are

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  9. Lines represented by x^(2)+2xy-y^(2)=0 are

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  10. If the lines represented by ax^(2)+4xy+4y^(2)=0 are real distinct, the...

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  11. if lines represented by equation px^(2)-qy^(2)=0 are distinct, then

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  12. Lines represented by px^(2)-qy^(2)=0 are real and coincident, if

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  13. Lines represented by px^(2)-qy^(2)=0 are imaginary, if

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  14. Which of the following equation does not represent a pair of li...

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  15. If l, m, n are in AP, then the line lx+my+n=0 will always pass through...

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  16. The separate equations of the lines represented by the equation x^(2)-...

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  17. The separate equations of the lines represented by the equation 3x^(2)...

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  18. The separate equations of the lines represented by the equation 5x^(2)...

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  19. The separate equations of the lines represented by the equation 5x^(2)...

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  20. The separate equations of the lines given by (x-4)^(2)-16(y-5)^(2)=0 a...

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