Maths help with roots of equation?
Maths help with roots of equation?
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
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