(3a - 2b)(3a+2b) + (2b - 2,5a)(2b + 2,5a) = 9a² - 4b² + 4b² - 6,25a² = 2,75a²
При a = -2/11:
2 , 75 * (-2/11)² = 2 3/4 * 4/121 = 11/4 * 4/121 = 1/11
(2a - 3b)(2a + 3b) + (2,5b - 2a)(2,5b + 2a) = 4a² - 9b² + 6,25b² - 4a² = -2,75a²
-2,75 * (-2/11)² = -2 3/4 * 4 / 121 = -11/4 * 4/121 = - 1/11
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(3a - 2b)(3a+2b) + (2b - 2,5a)(2b + 2,5a) = 9a² - 4b² + 4b² - 6,25a² = 2,75a²
При a = -2/11:
2 , 75 * (-2/11)² = 2 3/4 * 4/121 = 11/4 * 4/121 = 1/11
(2a - 3b)(2a + 3b) + (2,5b - 2a)(2,5b + 2a) = 4a² - 9b² + 6,25b² - 4a² = -2,75a²
При a = -2/11:
-2,75 * (-2/11)² = -2 3/4 * 4 / 121 = -11/4 * 4/121 = - 1/11