Question

(3a+5)(3a-6)+30=?????​

Answer 1

(3a+5)(3a-6)+30=

=3a(3a-6)+5(3a-6)+30=

=9a²-18a+15a-30+30=

=9a²-3a

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Answer 2

(3а + 5)(3а - 6) + 30 =

= 9а² - 18а + 15а - 30 + 30 =

= 9а² - 3а =

= 3а*(3а - 1)