5. Mustafa intends to save RM18,000 into their three children's account; Hanif, Syukri and Khairil; in the ratio \( 3: 4: x \). If Hanif gets RM6,000, find a. the total amount received by Khairil.

\( 6 a ^ { 2 } + 3 a c + 4 a b + 2 b \)

4. \( \log _{4} x^{2}-2 \log _{4} x-3=0 \)

Diketahui matriks \( M=\left[\begin{array}{ccc}3 & 0 & -2 \\ -5 & 2 & 0 \\ 0 & -3 & 4\end{array}\right] \) dan \( N=\left[\begin{array}{ccc}0 & 7 & 5 \\ 5 & -3 & 2 \\ 0 & -4 & -3\end{array}\right] \) adalah matriks berordc 3x3. Jika \( \mathrm{M}+\mathrm{N} \), maka tentukanlah hasil dari penjumlahan kedua matriks tersebut !

4. Realiza las operaciones indicadas y simplifica el lesultado: \( \begin{array}{ll}\text { A) } \frac{x^{2}-64}{2 x^{2}+16 x}= & \frac{\text { B) } 3 x-9}{x^{2}-9 x+18}=\end{array} \)

23. \( x^{3}-3 x=-1 \) olarsa, \( x^{2}+\frac{1}{x^{2}} \) ifadəsinin qiymatini tapın.