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IF a^2 + b^2 +c^2 =1 then the ra...

IF ` a^2 + b^2 +c^2 =1 ` then the range of ` ab+bc +ca` is

A

`[1//2,2]`

B

`[-1//2]`

C

`[-1//2,1]`

D

`[1,3//2]`

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-QUADRATIC EXPRESSIONS-EXERCISE 1B (QUADRATIC EXPRESSIONS)
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  2. If a,b,c are distinct positive numbers then the 3expression ( b+...

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  3. IF a^2 + b^2 +c^2 =1 then the range of ab+bc +ca is

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  4. In triangle ABC, range of (a^(2)+b^(2)+c^(2))/(ab+bc+ca) is (a,b,c are...

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  5. The solution set of -x^2 +3x+4gt 0 is

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  6. the solution set of x^2-4x - 21 ge 0 is

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  7. the solution set of 1 le x^2 -2x is

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  8. the solution set of x^2 gt 4x+5 is

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  9. The solution set of 2x^2-4x +5 gt 0 is

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  10. the solution set of x^2 - 2x + 2 lt 0 is

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  11. the set of all solutions of the inequation x^2-2x +5 le 0 in ...

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  12. The set of solutions of |x| ^2-5|x|+4 lt 0 is

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

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

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

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

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

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

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

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

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