(2x-5)²-(2x-3)(2x+3)=0
4х^2 - 20x + 25 - (4x^2 - 9) = 0 4x^2 - 20x + 25 - 4x^2 + 9 =0 - 20x = - 25 - 9 20x = 34 x = 34 : 20 x = 1,7
4x^2-10x+25-(4x^2-9)=0 4x^2-10x+25-4x^2+9=0 -10x+34=0 10x-34=0 10x=34 x=3.4