MBA Exam

A student by trial discovers one -ve and 2 +ve roots of the equation,x^5 - 9x^4 + 13x^3 + 57x^2 - 86x - 120 = 0.How many non-real roots does the equation have?Please explain.

1) 2
2) 1
3) 0
4) 4
5) None of these

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MBA Other Question

A and B start swimming simultaneously from two points P and Q
respectively, on a river towards each other. A crosses a floating cork
at a point S and B crosses the floating cork at a point T which is at a
distance of 8 km from point S. A and B cross each other at a distance of
2 km from T. It is given that the direction of flow of the river is
from P to Q and in still water, the ratio of speeds of A and B is 3 : 1.
P, S, T and Q ( in that order) are on the same straight line and assume
that A, B and the floating cork move along that line.If PQ = 100 km, then find the distance between the floating cork and A when A reaches Q

1) 11
2) 12
3) 13
4) 14
5) NOT
find the sum of all the positive integral value of n, such that 1001+n^2 is a perfect square??plz explain also.......

1) 640
2) 620
3) 684
4) 580