Question

Complete the square with the appropriate value for

z'2-20z+c

C = -10
C = 100
c=10
C = -100 ​

Answer 1

c = - 100

Explanation:

z² - 20c + c

to complete the square

add/subtract ( half the coefficient of the z- term )² to z² - 20c

= z² + 2(- 10)z + 100 - 100

= (z - 10)² - 100 ← with c = - 100