Does that equal to this?

[opaque finch]

Your numerator is correct

Your denominator not so much

Try factorising x^2-9

@iron dragon

[weak isle]

$x^2 - 9$ can be written as $(x - 3)(x + 3)$

[main furnace]

iaminfinityiq

[weak isle]

And $3x - 6$ can be written as $3(x - 2)$

[main furnace]

iaminfinityiq

[weak isle]

$2x - 4$ can be written as $2(x - 2)$

Sub that in and simplify :)

[main furnace]

iaminfinityiq

[torn plume]

for any constant a, x² + a² can't be factorized