Question

Rezolvati, in R ecuatia x(x+4)=12
Ajutor va rog:D

Answer 1

x (x + 4) = 12 →
x^2 + 4x - 12 = 0 →
x^2 + 6x - 2x - 12 = 0 →
x( x + 6) - 2( x + 6) = 0 →
( x - 2) ( x + 6) = 0 →
x = 2 sau x = -6

S = { -6; 2 }

Answer 2

x^2 +4x = 12
x^2 + 4x -12 = 0
d. = 16 - 4x(-12) = 16 + 48 = 64
x1 = -4 + 8 / 2 = 4/2 = 2
x2 = -4 - 8/2 = -12/2 = -6

S ={ -6 ; 2}