Question

12x²+3x=2x-x² alguem pode me ajudar?????

Answer 1

12x² +3x = 2x - x²
12x² +3x -2x + x² =0
13x² +x = 0 
x(13x + 1) = 0

∴x' = 0 

e 

13x + 1 =0 
13x = - 1
x = -1/13
∴ x'' = -1/13

S={ 0, -1/13}

Provando: 

13x² + x = 0
13*0² + 0 = 0
   0 + 0 = 0
      0 = 0

13*(-1/13)² -1/13 = 0
13* 1/ 169 - 1/13 = 0
13/169 -1/13 = 0
(13-13) ÷ 169 = 0
0 ÷ 169 =0 
0=0