Question

b) x2 + 8x + 20 = 0​

Answer 1

Resposta:

S{10, -2}

Explicação passo-a-passo:

x²-8x-20=0

a=1

b=-8

c=-20

∆=b²-4.a.c

∆=(-8)²-4.1.(-20)

∆=64+80

∆=144

x'=-(-8)+√144/2.1=8+12/2=20/2=10

x''=-(-8)-√144/2.1=8-12/2=-4/2=-2