Question

СРОЧНО ,помогите пожалуйста!!!!!!!!!

Answer 1

$1) : {x}^{2} - 21x + 68 = 0 \ {x}^{2} - 4x - 17x + 68 = 0 \ x(x - 4) - 17(x + 4) = 0 \ (x - 4)(x - 17) = 0 \ x - 4 = 0 \ x_1 = 4 \ x - 17 = 0 \ x_2 = 17 \ \ x_1 + x_2 = 4 + 17 = 21 \ x_1 cdot x_2 = 4 cdot 17 = 68 \ x_1 = 4 \ x_2 = 17$

$2) : {x}^{2} - 8x - 33 = 0 \ {x}^{2} + 3x - 11x - 33 = 0 \ x(x + 3) - 11(x + 3) = 0 \ (x + 3)(x - 11) = 0 \ x + 3 = 0 \ x_1 = - 3 \ x - 11 = 0 \ x_2 = 11 \ \ x_1 + x_2 = -3 + 11 = 8 \ x_1 cdot x_2 = - 3 cdot 11 = - 33 \ x_1 = - 3 \ x_2 = 11$