Question

y elevado 2 - 3y - 4=0

Answer 1

Formula de Bhaskara: 
y²-3y-4=0
a=1 b=-3 c=-4 

Delta: 9 - 4*1*(-4)
Delta: 9+16
Delta: 25
Raiz de delta = 5

x'=3+5/2 = 8/2 = 4
x''=3-5/2 = -2/2 = -1