Question

Descompuneti in factori:

1) 1/4 - a^2
2) x^2/9-9y^2/49

Answer 1

1) ( 1 / 2 - a )( 1 / 2  + a ) ;
2) ( x / 3 - 3y / 7 )( x / 3 +  3y / 7 ) ;