X² - 4x + 12 = 0
how do u solve by completing the square

Read the situations in the table below. then drag a graph and equation to represent each situation. indicate whether each of the relationships is proportional or non-proportional. edit : i got the right answer its attached

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Write an equation for the function that includes the points (2,100)and (3,100)