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If a, b in {1, 2, 3, 4}, then the number...

If `a, b in {1, 2, 3, 4}`, then the number of quadratic equations of the form `ax^(2)+bx+1=0`, having real roots is :

A

12

B

10

C

7

D

6

Text Solution

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The correct Answer is:
C
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PUNEET DOGRA-QUADRATIC EQUATIONS-PREV YEAR QUESTIONS
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  2. Consider the following statements in respect of the quadratic equation...

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  3. If a, b in {1, 2, 3, 4}, then the number of quadratic equations of the...

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  4. Simplify:- 3.5 * (80 ÷ 2.5) = ?

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  6. Under which one of the following conditions will the quadatic equation...

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  7. The value of (1)/(2+(1)/(2-(1)/(2-(1)/(2))))

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  8. Let A cup B = {x|(x-a)(x-b)gt0, where a lt b}, what are A and B equal ...

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  9. If p and q are the roots of the equation x^(2) - 30x + 221 = 0. What i...

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  10. What are the roots of the equations |x^(2) -x - 6| = |x + 2| ?

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  11. If a and b are the different real roots of the equations px^(2) + qx ...

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  12. If roots of the equation x^(2) + px + q = 0 are tan19 and tan26 then w...

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  13. Number of real roots of the equation x^(2) + 9|x|+20=0 is/are

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  14. The ratio of roots of the equations ax^(2) + bx + c = 0 and px^(2) + q...

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  15. If cos alpha and cos beta (0 lt a lt beta lt pi) are the roots of the ...

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  16. If alpha and beta (!=0) are the roots of the quadratic equation x^(2)+...

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  17. Consider the following expression : (1) x + x^(2) - (1)/(x) (2). ...

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  18. Simplify:- 70% of 100 * 12 = ? - 25

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  19. The equation |1-x| + x^(2) = 5 has :

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  20. The roots of the equation (q - r) x^(2) + (r - p) x + (p - q) = 0 ar...

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