Question

Решите плиз.
(2х – 1)^2= 4х^2 + 9.

Answer 1

4x^2 - 4x + 1 = 4x^2 + 9
- 4x + 1 = 9 
- 4x = 8
4x = - 8
x = - 2 

Answer 2

(2х-1)²=4х²+9
4х²-4х+1=4х²+9
4х²-4х+1-4х²-9=0
-4х-8=0
4х=-8
х=-2