Normal
1.<=> x[SUP]4 [/SUP] - 2x[SUP]2[/SUP] + 1 = x[SUP]2[/SUP] – 4x + 4 ó (x[SUP]2[/SUP] - 1)[SUP]2[/SUP] = (x – 2) [SUP]2[/SUP]2.
1.<=> x[SUP]4 [/SUP] - 2x[SUP]2[/SUP] + 1 = x[SUP]2[/SUP] – 4x + 4
ó (x[SUP]2[/SUP] - 1)[SUP]2[/SUP] = (x – 2) [SUP]2[/SUP]
2.
