Question

Which of the following correctly completes the square for the equation below?
x^2+6x=5
A) (x+3)^2=5
B) (x+3)^2=14
C) (x+6)^2=5
D) (x+6)^2=14
Please help me...

Answer 1

to complete the square you have to do this
\[ \large x^2+6x+a=5+a \]
now since
\[ \large (y+z)^2=y^2+2yz+z^2 \]
what is the value of a?

Answer 2

Is it one?

Answer 3

no!
watch this
\[ \large (x+k)^2=x^2+2xk+k^2 \]
compare with what you have

Answer 4

To be honest I don't know what I'm doing.. like at all.

Answer 5

if you compare the last i wrote with what u have then
\[ \large 6x=2kx \]
then 6=2k then k=3
OK with this a=?