5) \( \left(2 v^{3}-20 v^{2}+56 v-46\right) \div(v-6) \quad \) 6) \( \left(8 r^{3}-49 r^{2}-45 r-36\right) \div(r-7) \)

d) \( \left[\frac{\left(\frac{x+y}{x-y}\right)^{2}-\left(\frac{x-y}{x+y}\right)^{2}}{\left(\frac{x+y}{x-y}\right)^{2}+\left(\frac{x-y}{x+y}\right)^{2}-2}\right]:\left(1+\left(\frac{x}{y}\right)^{2}\right) \)

c) \( \sqrt{2 x}-1=\sqrt{x+1} \)

Jika \( \left(\begin{array}{cc}-2 & 2 \\ 5 & y\end{array}\right)\left(\begin{array}{ll}5 & 3 \\ x & 4\end{array}\right)=\left(\begin{array}{cc}-6 & 2 \\ 27 & 19\end{array}\right) \), cari nilai \( x \) dan \( y \). If \( \left(\begin{array}{cc}-2 & 2 \\ 5 & y\end{array}\right)\left(\begin{array}{cc}5 & 3 \\ x & 4\end{array}\right)=\left(\begin{array}{cc}-6 & 2 \\ 27 & 19\end{array}\right) \), find the value of \( x \) and \( y \)

Given that \( x^{2}+4 x+7=(x+p)^{2}+q \) for \( 11 x \), find the values of \( p \) and \( q \). Write lown the least possible value of \( x^{2}+4 x \) 7 and state the value of \( x \) for which is occurs.

4. The graph of the quadratic polynamial \( p(x)=a x^{2}+b x+c \) intersects the \( x \) axis at two points at least