Question

Помогите решить:
(2x+5)^2-(2x-3)(2x+1)=4

Answer 1

( 2x + 5 )^2 - ( 2x - 3 )( 2x + 1 ) = 4
4x^2 + 20x + 25 - ( 4x^2 + 2x - 6x - 3 ) = 4
4x^2 + 20x + 25 - 4x^2 + 4x + 3 = 4
24x = 4 - 28
X = - 24 : 24
X = - 1

Answer 2

(2x+5)^2-(2x-3)(2x+1)=4
4х²+20х+25-(4х²-6х+2х-3)=4х²+20х+25-4х²+4х+3=24х+28=4
24х=4-28
24х=-24
х=-1