Question

x²+5x-36=0 =>V={-9,4} como fazer?

Answer 1

a=1, b=5, c=-36
Δ=5²-4.1.(-36)
Δ=25+144
Δ=193
x=(-5+-sqrt169)/2.1
x=(-5+-13)/2
x1=(-5+13)/2=8/2=4
x2=(-5-13)/2=-18/2=-9

Answer 2

a=1 b=5 C=-36
*5²-4.1.(-36)
*25+144
*169
x= -5+/-169  x= -5+13/2 = 4
       2.1         X= -5-13/2 =-9