Question

Solve by complete sqaure method
x² - 9x + 20 = 0

Answer 1

Answer:

x^2-2.(9/2)x+(9/2)^2-(9/2)^2+20=0

{x-(9/2)}^2-(81/4)+20=0

{x-(9/2)}^2-(1/4)=0

{x-(9/2)}^2=1/4=(1/2)^2

x-(9/2)=1/2

x=(1/2)+(9/2)=10/2=5