X^4 - (2x-3)^2 = 0;
(x^2 - (2x-3) )*( x^2 + 2x-3) = 0;
(x^2 - 2x + 3)*(x^2 + 2x -3) = 0;
x^2 - 2x + 3 = 0 или x^2 + 2x -3=0;
1) x^2 -2x+3 = 0;
D/4 = 1 - 3 <0 ,тут решений нет.<br>2) x^2 + 2x - 3 = 0;
D/4 = 1 + 3 = 4 = 2^2;
x1 = (-1-2) = -3;
x2 = (-1+2) = 1;