x(x-5)(x+2)=0 is x positive?

1.x^2-7x is not=0

x=0 , 5 and -2

x^2-7x

for x=0 the above is true
x=5 the above is true
x=-2 the above is true so 1 is true only when x is both positive and negative so insuff A and D out

2.x^2-2x-15 is not equal to 0

for x=0 2 is true
x=5 2 is not true
x= -2 is true again x may be positive or negative so insuff B is out left with c and E

combine 1 and 2 for x= -2 both are satisfied hence it is negative 0 also satisfy this so x is either 0 or negative but not positive

so C

got it!! Thanks Pradeep

well come ananat