Select the correct answer. The equation can be solved by completing the square. What number should go in the blanks for the first step

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4