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the expression -7x ^2 + 8x -9 is po...

the expression ` -7x ^2 + 8x -9` is positive if x lies in

A

`(-oo ,1) cup (2,oo)`

B

`(-oo ,2) cup (3,oo)`

C

`phi`

D

`R`

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-QUADRATIC EXPRESSIONS-EXERCISE 1B (QUADRATIC EXPRESSIONS)
  1. The set of solutions of |x| ^2-5|x|+4 lt 0 is

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  2. if the expression 4x - 5x^2 +1 is positive if x lies in

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  3. the expression -7x ^2 + 8x -9 is positive if x lies in

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  4. the expression x^2 -5x-6 is negative is x lies in

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  5. The greatest positive integral value of x for which 200-x ( ...

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  6. The least integral value of x for which 33-x (2+3x )gt 0 i...

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  7. The integer k for which the inequality x^2 - 2 (4k -1) x+ 15 k^...

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  8. IF the difference between the roots the roots of the equation ...

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  9. IF x^2 +6x - 27 gt 0 -x^2 +3x +4>0 then x lies in the interv...

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  10. The set of values of x for which the inequalities x^2 -3x-10 l...

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  11. The set of values of x for which the inequalities x^2 -2x+3 gt ...

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  12. IF x^2 - 2x +3 gt 0 , 2x^2 + 4 x + 3 gt 0 then x lies in the...

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  13. the greatest negative integer satifying x^2 - 4x - 77 lt 0 a...

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  14. If x gt 0 then the least value of x +1/x is

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  15. the least value of cos ^2 x + sec ^2 x is

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  16. The range of (x^2 + 2x +1)/( x^2 +2x -1) is

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  17. The range of ( x^2 - 2x +9)/( x^2 +2x + 9 ) is

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  18. The range of (x^2-2x+3)/(x^(2)-2x-8) is

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  19. The range of (x^2-2x+3)/(x^(2)-2x-8) is

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  20. IF x is real then the value of ( x ^2 - 3x +4)/( x^2 +3x +4) ...

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