Maths help with roots of equation?

Posted on 2016-12-05 18:36:00 in Math by RITU

Q1)If the equation x^4 + ax^3 + bx^2 + cx + d = 0 (where a, b, c, d are real co-efficient different from zero) has a pure imaginary root then the expression c/ab + ad/bc has the value equal to 

1)0 
2)1 
3)-2 
4)2 

Q2) If roots of the equation x^4 – 12x^3 + bx^2 + cx + 81 = 0 are positive then root of equation 2bx + c = 0 is 

1)-1/2 
2)1/2 
3)1 
4)-1 

Q3) If the roots of the quadratic equation ax2 + bx + c = 0 are (k+1)/k and (k+2)/(k+1), then [(a)/(a+b+c)]^2 equals 

1)k^2 
2)(k+1)^2 
3)(k+2)^2 
4)(k^2) * (k+1)^2 

Please answer fast whatever question you are sure bout

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