Question

resolva o exercício 4

Answer 1

x²+2x-15=0 a=1 b=2 c= -15 Δ= b²-4.a.c Δ= (2)²-4.1.(-15) Δ= 4+60 Δ= 64 X' = -2 + 8/2.1 X' = 6/2 X' = 3 X''= -2 -8/2.1 X'' = -10/2 X" = -5 S = {-5, 3}

Answer 2

xˆ2 + 2x=15
xˆ2 + 2x - 15=0
4-4.1.-15
Δ= 64

xˆ= -2 + 8 / 2 === 3   (o valor da resposta)

x= -2-8 / 2 ==== -5