Question

Разложите на множители 9(а+2)²-4

Answer 1

9(a + 2)^2 - 4 = 
= (3(a + 2) - 2) (3(a + 2) + 2) = 
= (3a + 6 - 2) (3a + 6 + 2) = 
= (3a + 4) (3a + 8) 

Answer 2

$9(a+2)^2-4=[3(a+2)+2][3(a+2)-2]$