Question

√x+3+x=3

ajudem, por favor.

Answer 1

Resposta:

x+3

=x−3(

x+3

)

2

=(x−3)

2

x+3=x

2

−6x+9−x

2

+6x−9+x+3=0−x

2

+7x−6=0

Δ = b² - 4ac

Δ = 7² - 4(-1)(-6)

Δ = 49 - 24

Δ = 25

x' = (-b + √Δ)/2a x'' = (-b - √Δ)/2a

x' = (-7 + √25)/2(-1) x'' = (-7 - √25)/2(-1)

x' = (-7 + 5)/-2 x'' = (-7 - 5)/-2

x' = -2/-2 x'' = -12/-2

x' = 1 x'' = 6

S = {1, 6}