In order to get the answer, let us analyze the given image first. The formula for getting the area of a triangle is A = 1/2(b*h). So let us plug in the given values. A = 1/2(4x)(7x) A = 1/2 (28x2) A = 14x^2 Therefore, the correct answer would be option D. The area of this triangle expressed in monomial is 14x^2. Hope this answer helps.