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The diagram shows a quadrilateral.$\newline$The lengths of the sides of the quadrilateral are written as expressions.$\newline$a Work out the lengths of the sides of the quadrilateral when $\newline$$a=-5$ and $\newline$$b=2$.$\newline$b Use your answers to part a to work out the perimeter of the quadrilate when $\newline$$a=-5$ and $\newline$$b=2$.$\newline$Write an expression for the perimeter of the quadrilateral.$\newline$Show that the expression can be simplified to $\newline$$a+4a^{2}+19b$.