How do you solve using the completing the square method $x^2 - 8x = 9$ ?

Question

1225 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-02-27T04:26:17

It is

$x^2 - 8x = 9=>x^2-8x-9=0=> (x-4)^2-25=0=> (x-4)^2-5^2=0=> [x-4+5]*[x-4-5]=0=> (x+1)*(x-9)=0$

Hence the solutions are $x=-1$ and $x=9$

How do you solve using the completing the square method x^2 - 8x = 9x^2 - 8x = 9?