Which are the roots of the quadratic function f(b) = b? - 75? check all that apply. b=53 b= -5/ b=3/5 b = -35 b = 2575 ob=-253

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.