Question

Formula de Bhaskara : -x²+2x+8

Answer 1

a= -1
b=2
c=8

Δ=b²-4.a.c
Δ=2²-4.(-1).8
Δ=4+32
Δ=36

x= -b+-√Δ   /2.a 
x= -2+-√36 / 2.-1
x= -2+-6    /-2

x¹= 4 /-2 
x¹= -2

x²= -8 /-2
x²= 4 

S= {-2, 4}

Bons estudos!