(4a-b²)(-2b)=?

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(4a-b²)(-2b)=?

(4a-b²)(-2b)=4a(-2b)-b²(-2b)=-8ab+2b³;

=4a×(-2b)-b²(-2b)
=2b³-8ab

(4a-b²)(-2b)
=2b³-8ab