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IF 3+i is a root of the equation x^...

IF ` 3+i` is a root of the equation ` x^2 + ax + b=0` then a=

A

3

B

-3

C

6

D

-6

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The correct Answer is:
D
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AAKASH SERIES-QUADRATIC EQUATIONS & EXPRESSIONS-PRACTICE EXERCISE
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  2. The number of integral solutions of 2(x^(2)+(1)/(x^(2)))-7(x+(1)/(x)) ...

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  3. IF 3+i is a root of the equation x^2 + ax + b=0 then a=

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  4. The roots of the equation x^(2)-2ax+8a-15=0 are equal, then a =

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  5. If one root of the equation I x ^2 - 2(1+i) x+ (2-i) =0 is 2- I ...

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  6. If x = 1 + i is a root of the equation x^(2) - ix - 1-i = 0 then the o...

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  7. Assertion (A) : If the roots of (b-c) x^(2) + (c-a) x+(a-b) = 0 are eq...

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  8. If x^(2) - (5m - 2)x + 4m^(2) + 10m + 25 is a perfect square then m = ...

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  9. The roots of the equation x^(2)+2ax+a^(2)+b^(2)=0 are

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  10. The roots of the equation 2(a ^2 +b^2)x^2+2(a+b)x+1=0 are

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  11. For p, q in R, the roots of (p^(2) + 2)x^(2) + 2x(p +q) - 2 = 0 are

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  12. If the equation x^(2)-x+ m^(2) = 0 has no real roots then m can satisf...

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  13. If the roots (1)/(x+k+1)+(2)/(x+k+2)=1 are equal in magnitude but oppo...

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  14. The roots of the equation 5x^(2)+10x-7=0 are

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  15. The set of values of p for which the roots of the equation 3x^(2) + 2x...

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  16. If the roots of ax^(2)+ bx + c = 0 are equal in magnitude but opposite...

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  17. If the roots of ax^(2) + bx + c = 0 are both positive and b lt 0, then

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  18. The value of 'a' for which the quadratic equation 2x^(2) - x(a^(2) + 8...

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  19. Let alpha, beta be the roots of the equation (x - a)(x - b) = c, c != ...

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  20. The equation |x|^(2) -|x|-6 = 0 has

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