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