(2a²﹣2/3a﹣4/9)(-9a)=?

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(2a²﹣2/3a﹣4/9)(-9a)=?

(2a²﹣2/3a﹣4/9)(-9a)=?
(2a²﹣2/3a﹣4/9)(-9a)=?

(2a²﹣2/3a﹣4/9)(-9a)=?
=2a²×(-9a)-2/3a×(-9a)-4/9×(-9a)
=-18a³+6a²+4a

=2a²×(-9a)-2/3a×(-9a)-4/9×(-9a)
=-18a³+6a²+4a
=-2a(9a²-3a-2)
=-2a(9a²-3a+1/4-1/4-2)
=-2a[(3a-1/2)²-9/4]