how do you complete the square and factor x^2-8x+?

Question

Complete the square

Answer 1

Hi Joyce,

 

In order to complete the square you need to add the square of a number that when multiplied by 2 is -8

 

so

 

our number is -4  (16 when squared)

 

and then we get x² -8x + 16

 

now factor

 

(x-4)(x-4)

 

Hope this helps