Final answer:
Due to missing information in the question, it is not possible to provide a precise expression for the area of the shaded section. Area calculations for rectangles and triangles require specific dimensions and positions, which are not provided in the available detail.
Step-by-step explanation:
The question asked is how to calculate the area of a shaded section in a rectangle, which seems to be a mixture of a rectangle and a triangle, with the expressions 'M + 8', '3', and '6' describing the sides of the shapes.
However, the question seems to have missing information, specifically about the placement of these sides and whether they describe a rectangle or a triangle within the rectangle. Therefore, a precise answer cannot be provided. To calculate an area of a rectangle, one multiplies the length by the width. If the area includes a triangular section, the formula 1/2 × base × height must be used for the triangle. For example, if 'M + 8' is the length of the rectangle and '3' is its width, the rectangular area would be 'M + 8' multiplied by '3'. If '6' represents the height of the triangle, the area of the triangle would be 1/2 × '6' (base) × '3' (height).
Without clearer information on the actual dimensions and positions of the shapes, it is not possible to provide a specific expression or numerical answer for the area of the shaded section. Always ensure that you have all the necessary information before calculating areas or any other geometric property. Additionally, remember that in mathematics, the precise and correct use of formulas, expressions, and units is vital to ensure accurate results.