13. Sabit olmayan bir \( f \) fonksiyonu her \( x, y \in R \) için, \( f(x+y)=f(x) . f(y) \) bağıntısını sağlyor. \( f(0) \) nedir?

8. \( \frac{\sqrt{27 a^{3} b^{6}}}{\sqrt{3 a b^{6}}-5 a b^{2}}= \)

Diketahui sistem persamaan tinier berikut ini : \[ \begin{array}{l}-1 x+y+2 z=2 \\ 3 x-1 y+z=6 \\ -1 x+3 y+4 z=4\end{array} \] Tentukan solusi persamaan linear tersebut menggunakan metode gauss!

a. \( \frac{2 x^{3}+6 x-6}{x^{3}-1} \)

tinh \( a x^{2}+2 x+3 y=6 \)

In the \( x y \)-plane, a parabola has vertex \( (9,-14) \) and intersects the \( x \)-axis at two points. If the equation of the parabola is written in the form \( y=a x^{2}+b x+c \) where \( a, b \), and \( c \) are constants, which of the following could be the value of \( a+b+c \) ? (A) -23 (B) -19 (D) -12