Question

Resolva as equaçoes do 2° grau sebdo u=r
b) x^2-2×-3=0

Answer 1

b)
x²-2x-3=0

a=1
b=-2
c=-3

Δ=b²-4ac
Δ=(-2)²-4(1)(-3)
Δ=4+12
Δ=16

x=(-b±√Δ)/2a={-(-2)±√16)/2=(2±4)/2

x'=(2+4)/2=6/2=3

x"=(2-4)/2=-2/2=-1

S={-1 ,3}