x^2-6x+9
=>(x^2-3x)-(3x-9)
=>x.(x-3)-3.(x-3)
=>(x-3).(x-3)
=>(x-3)^2
@htkbaam
Đáp án:
Ta có :
$x^2 - 6x + 9$
$ = x^2 - 3x - 3x + 9$
$ = x.( x - 3) - 3.( x - 3)$
$ = ( x - 3)(x - 3)$
$ = ( x - 3)^2$
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