Solution Substitute the givens into the formula Area = 1/2 * 10 * (4x^2y + 2xy^2) Area = 5 * (4x^2y + 2xy^2) What to do next? I would remove the brackets Area = 5 * 4x^2y + 5 * 2xy^2 Area = 20x^2y + 10xy^2 <<<< Answer
Also possible is to take out more common factors. The common factor of 4x^2y + 2xy^2 is 2xy and what is left over is 2x + y