Translate: four less than a number is twelve

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Which of the following expressions is equal to 2x^2+8

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?