A/ X2 – 2X – 15 = 0 B/ X4 – 5X2 + 4 = 0A/ X2 – 3X – 10 = 0 B/ X4 – 10X2 + 9 = 0
Bài 1: Giải phương trình: a/ x
2
– 2x – 15 = 0 b/ x4
– 5x2
+ 4 = 0a/ x2
– 3x – 10 = 0 b/ x4
– 10x2
+ 9 = 02
– 2x – 15 = 0 b/ x4
– 5x2
+ 4 = 0a/ x2
– 3x – 10 = 0 b/ x4
– 10x2
+ 9 = 0