Question

calcular as raizes da equaçao (x+2)²=9

Answer 1

(x+2)²=9

x² + 4x +4 = 9

x² +4x -5 = 0

Δ= b² -4.a.c

Δ= 4² -4.1.(-5)  = 16+20 = 36


x = - b +-√Δ / 2.a

x1 = - 4 + √36 / 2.1  = 1

x2 = -4 - √36/2.1 = - 5

raízes são { 1 , -5 }

Answer 2

(x+2)²=9 =>
(x+2)=±√9 =>
(x+2)=±3 =>
x'=
(x+2)=3
x=3-2 => x'=1
(x+2)=-3 => x=-3-2 => x''=-5
S={-5,1}