Question

Answer 1

a.\(P=2+\sqrt{3}+2-\sqrt{3}-\left(2+\sqrt{3}\right)\left(2-\sqrt{3}\right)\)

\(P=4-\left(2^2-\sqrt{3^2}\right)\)

\(P=4-\left(4-3\right)\)

\(P=4-4+3\)

\(P=3\)

b.\(\Leftrightarrow\left\{{}\begin{matrix}6x+2y=10\\x-2y=-3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}7x=7\\x-2y=-3\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=1\\1-2y=-3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=2\end{matrix}\right.\)