What number would you add to both sides of x2 + 7x = 4 to complete the square?
A. 2^2
B. 7^2
C. 7^2/2
D. (7/2)^2

Answer these questions showing your work plz

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?