Solve the equation \(5 - 8 x - x ^ { 2 } = 0\), giving your answers in simplified surd form.
Solve the inequality \(5 - 8 x - x ^ { 2 } \leqslant 0\).
Sketch the curve \(y = \left( 5 - 8 x - x ^ { 2 } \right) ( x + 4 )\), giving the coordinates of the points where the curve crosses the coordinate axes.