Question

What number must you add to complete the square? x^2 + 8x = -3
A. 16
B. 8
C. 4
D. 64

Answer 1

May I help?

Answer 2

Of course!

Answer 3

@3mar are you going to help or not?

Answer 4

I am !

Answer 5

As the coefficient of x^2 is unity, then we are going to add and subtract the half of the x-coefficient squared!

Answer 6

uhh...

Answer 7

That means
look at :
\[(1)x^2\]

then:
\[ ( )x\]

\[x^2+8x+(\frac{ 8 }{ 2 })^2-(\frac{ 8 }{ 2 })^2=-3\]

Answer 8

I'm still not comprehending

Answer 9

to get
\[x^2+8x+16=(x+4)^2\]
you must add 16 and subtract 16

easy now?

Answer 10

Partially...

Answer 11

add 16 and subtract 16 don't change anything in one side of the equation!