а) x^2 + 8x + 31 = x^2 + 8x + 16 + 15 = (x + 4)^2 + 15
б) 25a^2 - 20a + 10 = 25a^2 - 20a + 4 + 6 = (5a - 2)^2 + 6
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а) x^2 + 8x + 31 = x^2 + 8x + 16 + 15 = (x + 4)^2 + 15
б) 25a^2 - 20a + 10 = 25a^2 - 20a + 4 + 6 = (5a - 2)^2 + 6