Question

Descompuneti in factori=
x patrat-y patrat=
x la patrat -9=
4-a la patrat
9y patrat -16 z la patrat=
25 x patrat -9 y patrat=
a patrat b patrat -49=

Answer 1

x² - y² = ( x -y) · ( x +y) 
x² - 9 = ( x -3 ) · ( x +3) 
4 - a² = ( 2 -a ) · ( 2 +a )
( 3y - 4z) · ( 3y + 4z) 
(5x  - 3y ) · ( 5y + 3y ) 
( ab - 7 ) · ( ab + 7)

Answer 2

$x^2-y^2=(x-y)(x+y) \\ \\ x^2-9=(x-3)(x+3) \\ \\ 4-a^2=(2-a)(2+a) \\ \\ 9y^2-16z^2=(3y-4z)(3y+4z) \\ \\ 25x^2-9y^2=(5x-3y)(5x+3y) \\ \\ a^2b^2-49=(ab-7)(ab+7)$