Найдите корни уравнений а)3x(x-1)+(x в квадрате -1)=0 Б)2(y-1)-(1-y) в квадрате =0 В)(z-1) в квадрате(z+4)=0

1) 3x^2 - 3x + x^2 - 1 = 0 4x^2 - 3x - 1 = 0 D = b^2 - 4ac = 9 + 16 = 25 = 5^2 x1 = ( 3 + 5) / 8 = 1 x2 = ( 3 - 5) / 8 = - 0,25 2) 2( y - 1) - ( 1 - y)^2 = 0 2y - 2 - ( 1 - 2y + y^2) =0 2y - 2 - 1 + 2y - y^2 = 0 - y^2 + 4y - 3 = 0 y^2 - 4y + 3 = 0 D = b^2 - 4ac = 16 - 12 = 4 = 2^2 y1 =( 4 + 2) / 2 = 3 y2 = ( 4 - 2) / 2 = 1 3) ( z- 1)^2(z+ 4) = 0 z- 1 = 0 z= 1 z + 4 = 0 z = - 4