Question

Responda : 2 raiz de x+3 = x.

Answer 1

2✔x+3 = X

(2✔x+3)^2 = (x)^2

4 . (X +3) = x^2

4x + 12 - x^2 = 0

-x^2 + 4x +12 = 0 . (-1)

X^2 - 4x -12 = 0

= (-4)^2 - 4.1. (-12)

= 16 + 48

= 64

X ' = -(-4) + 8/2 = 4 +8/2 = 12/2 = 6

X" = -(-4) - 8/2 = 4 -8/2 = -4/2 = -2

As raízes são ( 6, -2)

Espero ter ajudado. ☺