1)9(9-5x)^2+17(9-5x)+8=0 2)8(10-3x)^2-5(10-3x)-3=0
1)9(9-5x)^2+17(9-5x)+8=0 2)8(10-3x)^2-5(10-3x)-3=0
Ответ(ы) на вопрос:
9-5x = m 9m^2 + 17m + 8 = 0 D = 289 - 72*4 = 1 m1 = (-17 - 1)/ 18 = -1 m2 = (-17 + 1)/ 18 = -8/9 9 - 5x = -1 x = 2 9 - 5x = -8/9 x = 89/45 10 - 3x = n 8n^2 - 5n - 3 = 0 D = 25 + 96 = 121 n1 = (5 - 11)/ 16 = -3/8 n2 = (5 + 11)/ 16 = 1 10 - 3x = -3/8 x = 21/24 = 7/8 10 - 3x = 1 x = 3
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