Răspuns:
Explicație pas cu pas:
a)
25x^2 - 1 = (5x - 1)(5x + 1)
(5x - 1)(5x + 1) / (5x + 1) = 5x - 1
___________
b)
49x^2 - 1 = (7x - 1)(7x + 1)
(7x + 1) / (7x - 1)(7x + 1) = 1 / (7x - 1)
_________
c)
36x^2 - 121 = (6x - 11)(6x + 11)
36x^2 + 132x +121 = (6x + 11)^2
(6x - 11)(6x + 11) / (6x + 11)^2 = (6x - 11) / (6x + 11)
___________
d)
4x^2 + 32x + 64 = (2x + 8)^2
4x^2 - 64 = (2x + 8)(2x - 8)
(2x + 8)^2 / (2x + 8)(2x - 8) = (2x + 8)/(2x - 8)
