Question

Resolver y^2-4y-320=0

Answer 1

y²- 4y-320=0; descomponiendo
(y-20)(y+16) = 0
y-20= 0         y+16=0
y1= 20          y2= -16

Answer 2

y^2 - 4y -320 = o 
y^2 - 4y= 320
5y^2 = 320
y^2= 320/5
y= √64
y=8