2 For each quadratic function: \( \begin{array}{lll}\text { i Find the axes intercepts. } & \text { ii Find the equation of the axis of symm } \\ \text { iii Find the coordinates of the vertex. } & \text { iv Hence sketch the function. } \\ \begin{array}{lll}\text { a } y=x^{2}-2 x-8 & \text { b } y=4 x-x^{2} & \text { c } y=x^{2}+3 x\end{array}\end{array} \).

Roger was told to think of a number, add 20 , then divide the result by 3 . The answer was Jower than Roger's original number. Deteruine the range of possible numbers Roger may have originally chosen.

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

5.7 Determine the equation of \( h \) if \( h(x)=g(x+1)-2 \)

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