Question

Срочно! Даю 20 балов

Answer 1

(3x - 2) × (3х + 2) + (4х - 5)² = 36 - 30х

9х² - 4 + 16х² - 40х + 25 = 36 - 30х

25х² - 40х + 21 - 36 + 30х = 0

25х² - 10х - 15 = 0

5х² - 2х - 3 = 0

а = 5; b = -2; c = -3.

D = b² - 4ac = 4 - 4×5×(-3) = 4 + 60 = 64

x1 = (-b + √D) : 2a = (2 + 8) : (2×5) = 10 : 10 = 1

x2 = (-b - √D) : 2a = (2 - 8) : (2×5) = -6 : 10 = -0,6

Ответ: -0,6; 1