Who knows how to complete the square of an equation plz .

Let's say you have an equation like

x^2 + 6x 

to complete the square you must make sure that the second term (6x in this case) contains the first one. the rest is just formula application.

a^2 + ba

(a + b/2)^2 - b^2 

so in our case

a^2 = x^2

a = x

b = 6
b/2 = 3

(x+3)^2 - 9

I hope that helps.!