Найдите корень уравнения : ( 2х - 5 ) ( 2х + 5 ) = 75; ( х - 9 ) ^ 2 = 49; ( 3х -7 ) ^ 2 = 121; ( х + 5 ) = 2

1) (2 * х - 5) * (2 * х + 5) = 75;(2 * х) ^ 2 - 5 ^ 2 = 75;4 * х ^ 2 - 25 = 75;4 * х ^ 2 = 75 + 25;х ^ 2 = 100 / 4;х1 = 5, х2 = -5;2) (х - 9) ^ 2 = 49;(х - 9) = 7; -7;х1 = 7 + 9 = 16; х2 = -7 + 9 = 2;3) (3 * х - 7) ^ 2 = 121;3 * х - 7 = 11; -11;х1 = (11 + 7) / 3 = 18 / 3 = 6;х2 = (-11 + 7) / 3 = -4 / 3 = -11/3;4) (х + 5) = 2;х = 2 - 5 = -3.