Question

x^2-8x+15=0 solve by completing the square please

Answer 1

add +1 -1

Answer 2

this will make the 15 a 16

Answer 3

in more detail please

Answer 4

x^2 - 8x + 16 -1 = 0

Answer 5

make sense?

Answer 6

no

Answer 7

damn...ok

Answer 8

usually u complete a square when u can't factorize a quadratic expression
so here because we can't factorise "x^2-8x+15=0" easily we try to make the 15 a 16 and when it is 16 then we can factorize like this :....

Answer 9

(x^2 - 8x + 16) -1 = 0
x^2 - 8x + 16 = 1
(x-4) (x-4) = 1
(x-4)^2 = 1
x-4 = SQRT (1) = 1
x = 1+4 = 5
makes sense? or not yet?