Răspuns:
Explicație pas cu pas:
( x+3)^2= x^2 + 6x + 9
(4x +5)^2= 16x^2 + 40x + 25
(3x +4y)^2= 9x^2 + 24xy + 16y^2
(6a + 4b)^2= 36a^2 + 48ab + 16b^2
( 4y -7 )^2= 16y^2 - 56y + 49
(2x – 5y)^2= 4x^2 - 20xy + 25
(x - 4) (x+4) = x^2 - 16
( x -5)( x+5) = x^2 - 25
( 3 –x) (3+x)= 9 - x^2