Consider the matrices \( X=\left[\begin{array}{rrr}x+y-1 & 0 \\ 0 & 3\end{array}\right] \) and \( Y=\left[\begin{array}{rr}5 & 0 \\ 0 & 2 x-3 y-7\end{array}\right] \) The value(s) of \( x \) for which both matrices have no inverses is/are given by: \( \begin{array}{l}x=-2 \text { or } x=2 \\ x=-2 \\ x=-2 \text { and } x=2 \\ \text { No such value of } x \text { exists }\end{array} \).

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

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!

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

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

1) \( \frac{10 x+8}{3 a-b}-\frac{9 x+5}{3 a-b}= \)