2. Rezolvați în \( \mathbb{C} \), următoarele ecuații de gradul al doilea: \( \begin{array}{lll}\text { a) } x^{2}-3 x+4=0 ; & \text { b) } x^{2}-2 x+2=0 ; & \text { c) } x^{2}-6 x+13=0 \\ \text { d) } x^{2}+8 x+17=0 ; & \text { e) } 4 x^{2}-4 x+17=0 ; & \text { f) }-9 x^{2}+6 x-10=0\end{array} \)

Find \( n \), \( 3 n-6=18 n^{2} \) A) 0.654 (B) -0.488 (C) 0.654 OR -0.488 (D) No real roots

3. At a school, \( 40 \% \) of the sikthegrade students said that hip-hop is their favorite kind of music. If 100 sixth-gade students preler hip hop music, how many sixth-grade studer are at the school? Explain or show your reasoning.

f) \( (-15 a b c+12 a b-9 a c-3 a) \div(-3 a) \)

expunencial \( \left.\left(4^{2}\right)\left(2^{3}\right)^{2 x-5}\right)=8 \)

Find \( x \). \( \frac{x-1}{3}=\frac{5}{x}+1 \) A. 6.36 OR -2.36 (B) 6.36 (C) 5.46 OR 2.36 (D) No real roots