Question

Descompuneti in factori
$(x+1)^{2}-9$  si  $4(a+1)^{2}-9$

 As vrea sa-mi explicati cum se rezolva !!!

Answer 1

Aplici formula diferentei de patrate!

1) ( x +1 - 3)(x + 1 + 3) =( x - 2 )( x + 4 );

2) [ 2( a + 1) - 3][ 2( a + 1) + 3] = ( 2a - 1 )( 2a + 4 ) = 2( 2a - 1 )( a + 2 );

Bafta!