Respuesta :

(3a+2)(4a+5)                  ......expand

12a^2+15a+8a+10         .......group like terms 15a + 8a

12a^2+23a+10               ....this s the answer!
(3a+2)(4a+5)
(3a+2)(4a+5)
(3a)(4a)+(3a)(5)+(2)(4a)+(2)(5)
12a^2+15a+8a+10
=12a^2+23a+10