a² - 2,5a = - 3a + 7,5
a² - 2,5a + 3a - 7,5 = 0
a² + 0,5a - 7,5 = 0 | * 2
2a² + a - 15 = 0
D = 1² - 4 * 2 * (- 15) = 1 + 120 = 121 = 11²
Ответ : при a = - 3 и a = 2,5
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a² - 2,5a = - 3a + 7,5
a² - 2,5a + 3a - 7,5 = 0
a² + 0,5a - 7,5 = 0 | * 2
2a² + a - 15 = 0
D = 1² - 4 * 2 * (- 15) = 1 + 120 = 121 = 11²
Ответ : при a = - 3 и a = 2,5