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If a, b, c are real, then both the roots...

If a, b, c are real, then both the roots of the equation `(x -b )(x -c)+(x -c)(x - a)+(x - a)(x - b)=0` are always

A

positive

B

negative

C

real

D

imaginary

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-MULTIPLE CHOICE QUESTIONS
  1. The number of common tangent to two circle x ^(2) +y^(2) =4 and x^(2) ...

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  2. If C is a point on the line segment joining A (-3, 4) and B (2, 1) suc...

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  3. If a, b, c are real, then both the roots of the equation (x -b )(x -c)...

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  4. Find the sum of the following geometric series : 1+(1)/(4)+(1)/(16)+...

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  5. A(-2,7),B(7,15),C(-1,-5)andD(h,k) are the vertices of a parallelogram...

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  6. The domain of definition of the function f(x)=sqrt(1+log(e)(1-x)) is

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  7. The value of ["tan"^(-1)(m)/(n)-tan^(-1)((m-n)/(m+n))] is -

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  8. lim(xto2)(sin(e^(x-2)-1))/(log(x-1))

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  9. Let f(x)=(sqrt(x+3))/(x+1) then the value of Lt(xto-3-0)f(x) is

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  10. f(x)=x+|x| is continuous for

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  11. prove that tan((pi)/(4)+(1)/(2) cos ^(-1)""(a) /(b) )+tan ((pi)/(4) ...

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  12. If i=sqrt-1 and n is a positive integer, then i^(n)+i^(n+1)+i^(n+3 is ...

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  13. int(dx)/(x(x+1)) equals

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  14. If x is a positive real number different from 1 such that log(a)^(x),l...

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  15. A line through the point A (2,0) which makes an angle of 30^(@) with t...

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  16. The equation sqrt3sinx+cosx=4 has

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  17. The slope at any point of a curve y=f(x) is given by (dy)/(dx)=3x^(2) ...

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  18. The modulus of (1-i)/(3+i)+(4i)/(5) is

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  19. The equation of the tangent to the conic x^(2)-y^(2)-8x+2y+11=0 at (2,...

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  20. A and B are two independent events such that P(AuuB')=0.8, and P(A)=0....

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