(a+6)[tex] {2} [/tex] -2a·(3-2a)

1) (a+6) × (a+6) =a²+6a+6a+36 = a²+12a+362) 2a × (3-2a) =6a-4a²3) a²+12a+36+6a-4a² = (4a²-a²)+18a+36