Question

(b,c)Ecuatii de gradul 2 am nevoie de (b,c)

Answer 1

[tex]x^4-3x^2-4=0 \Longrightarrow (x^2)^2-3x^2-4=0 x^2 = t, \ \ t \geq0\ \Longrightarrow t^2-3t-4=0 \Longrightarrow \begin{cases} t_1 = -1 \ \textless \ 0 , \ nu \ convine \\\;\\ t_2= 4 \end{cases} \\\;\\ \it Revenim\ asupra\ notatiei\ : \\\;\\ t^2=4 \Longrightarrow \ x^2 = 4 \Longrightarrow x= \pm2 [/tex]