Question

Equação do 2grau(1-y).(5+2y)=5

Answer 1

(1-y)(5+2y)=5
1.5+1.2y-y.5-y.2y=5
5+2y-5y-2y²=5
5-3y-2y²=5
-2y²-3y+5-5=0
-2y²-3y=0 (-1)
2y²+3y=0

a=2
b=3
c=0

x=(-b+-√b²-4ac)/2a
x=(-3+-√3²-4.2.0)/2.2
x=(-3+-√3²)/2.2
x=(-3+-3)/4

x1=(-3+3)/4
x1=0/4
x1=0

x2=(-3-3)/4
x2=-6/4
x2=-3/2
x2=-1,5

S={-1,5;0}