Question

a) (×+3)^2

b) (×+3).(×-3)

c) (x-3)^2

d) (×+3).(×+1)

Answer 1

a)
(×+3)²=
x²+3²=
x²=-9
x=√-9
(não existe valor real)

b)
(×+3).(×-3)
x²-3x+3x-9=
x²-9=
x=√9
x=3

c)
(x-3)²
x²-3²=
x=√9
x=3

d)
(×+3).(×+1)
x²+x+3x+3=

x²+4x+3=0
∆=4²-4.1.3
∆=16-12
∆=4

x'= -4+2/2
x'= -1

x"=-4-2/2
x"=-3