Question 311941
300/x+20 + 300 / x-20 = 4

LCM (x+20)(x-20)
..
300(x-20)+300(x+20)= 4x^2-1600
300x-6000 +300x+6000= 4x^2-1600
4x^2-600x-1600=0
x^2-150x-400=0
Find X1 , X2 the roots of the equation

X1= 150+sqrt((-150)^2+1600) / 2

x= 152.6 mph