А)x^2 - 8x + 15 = (x - 4 - 1)(x - 4 + 1) = (x - 5)(x - 3)A)
В)x^2 - 8x + 15 = x^2 - 8x + 16 - 1 = (x - 4)^2 - 1
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А)x^2 - 8x + 15 = (x - 4 - 1)(x - 4 + 1) = (x - 5)(x - 3)A)
В)x^2 - 8x + 15 = x^2 - 8x + 16 - 1 = (x - 4)^2 - 1