Help with algebra ?

What number must you add to complete the square?
x2 + 10x = 29

Question

Help with algebra ?

What number must you add to complete the square? 
x2 + 10x = 29

anonymous · Answer

2 is an exponent

retireed · Answer

I never was any good with these.  I always forget the process.

anonymous · Answer

haha same i have like no idea what to do

retireed · Answer

I think you need to add a half of a * b     where a and b   are ax^2 + bx   so add  ab/2

Let me work on it some okay?

anonymous · Answer

no problem!

retireed · Answer

No that's not right.  I think now you add  (ab/2)^2 

Trying again....

anonymous · Answer

the options are 25, 5, 20, 10

retireed · Answer

Oh that helps!

retireed · Answer

So 
     x^2 + 10x +  ???  = 29      

     (ab/2)^2  is 1*10/2  squared  equals 5^2  or 25  the answer

      x^2 + 10x +  25  = 29 +25
        (x+5) (x+5)   = 54

          (x+5)^2 = 54       That's what I think it is after I added 25 in order to complete the square.

anonymous · Answer

Thank you! @retirEEd