What number must you add to complete the square x^-8x=39

The number must be added to complete the square is  16

Step-by-step explanation:

It is given that,

x^2 - 8x = 39    (1)

The quadratic equation is of the form ax^2  + bx + c =0

To complete the square we have to add (b/2)^2 and subtract (b/2)^2

Therefore the eq (1) becomes

here b= -8, so we have to add (8/2)^2 = 4^2 = 16

Therefore the number is 16

To find x

x^2 - 8x  = 39

Add 16 to both sides

x^2 - 8x +16  = 39 + 16

(x - 4)^2 = 55

x - 4 = √55

x = √55 -4

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step-by-step explanation:

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.