Question

Descompuneti in factori:
a ^{2} - b ^{2} +4a +4

Answer 1

= ( a - b) (a +b) + 4 ( a + b) = ( a + b) ( a - b + 4) 

Answer 2

$a^{2}-b^{2}+4a+4$
$a^{2}+4a+4-b^{2}$
$(a+2)^{2}-b^{2}$
$(a+2-b)\cdot(a+2+b)$