Respuesta :

shirogay
if i'm correct, the answer should be

-3a

hope this helped! 8)

ANSWER:

[tex] {3a}^{2} - 9a \\ = {( \sqrt{3} a)}^{2} - {(3 \sqrt{a}) }^{2} \\ = using \: formula \: {a}^{2} - {b} = (a + b)(a - b) \\ = ( \sqrt{3} a + 3 \sqrt{a} )( \sqrt{3} a - 3 \sqrt{a} )[/tex]

HOPE IT HELPED YOU ☺

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good job