+37170 my^2 +2y - 4 = 0
Use quadratic formula to find the only way for one root is sqrt( 4+16m) = 0 so m = -1/4
Leaving the only y= 4 root
+37170 my^2 +2y - 4 = 0
Use quadratic formula to find the only way for one root is sqrt( 4+16m) = 0 so m = -1/4
Leaving the only y= 4 root
-14 my^2+2y-4=0
-4(y^-2)+2(y^-1)+m=0
4(y^-2)-2(y^-1)-m=0
4(y^-2)-2(y^-1)=m
(2(y^-1)-0.5)=4(y^-2)-2(y^-1)-m
(2(y^-1)-0.5)=0
m=-0.25
y=4
That's what you meant by one root, right?
