Question

Rezolvati ecuatia: ×la 2-3×-4=0

Answer 1

x^2-3x-4=0
x•(x+3•4)=0
x•(x+12)=0

x=0
x+12=0

$x_{1}=-12$
$x_{2}=0$

Answer 2

x^2 - 3x - 4 = 0 
a =1
b =-3
c = -4
delta = b^-4ac = 9 - 4 x 1 x(-4) = 9 + 16 = 25 

x1 = (3 + 5) / 2 = 4  
x2 = 3 - 5 / 2 = -1

x = { -1 si 4}