(2х-1)*(2х+1)-(2х+3)^2=38 помогите

( 2x - 1) * ( 2x + 1) - ( 2x + 3)^2 = 384 - 1 - 4 - 12x - 9 = 38-1 - 12x - 9 = 38-12x = 48 | : (-12)X = -4

(2х-1)*(2х+1)-(2х+3)²=38 4х²-1-4х²-12х-9=38-10-12х=38-12х=38+10-12х=48х=-4