Solving equation x ^ 2-16x-4 = 0 by factorization

Solving equation x ^ 2-16x-4 = 0 by factorization

x^2-16x-4=0
x^2-16x+64-64-4=0
(x-8)^2-68=0
(x-8-2√17)(x-8+2√17)=0
X = 8 + 2 √ 17 or x = 8-2 √ 17

In 7x-8x = 0, X and y are in positive proportion, right or wrong

7x-8y = 0
The reduction result is x / y = 8 / 7, which is in positive proportion
Positive proportion means that the ratio of the two is a fixed value, never need to consider 0~

If 7x-2y = 0, then the value of (x / Y-Y / x) / (x / Y-1 + Y / x)

7x-2y=0,x/y=2/7,y/x=7/2
So the original formula = (2 / 7-7 / 2) / (2 / 7 - 1 + 7 / 2) = (4-49) / (4-14 + 49)=
=-45/39=15/13