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(x-3)² = x² - 6x + 9
2(x-3)² - (x+1)² = 0
2(x² - 6x + 9) - (x² + 2x + 1) = 0
2x² - 12 x + 18 - x² - 2x - 1 = 0
x² - 14x + 17 = 0
Δ = 14² - 4*17 = 128 = 2^7
√Δ = 8√2
x = (14 + 8√2)/2 = 7 + 4√2
lub x = (14 - 8√2)/2 = 7 - 4√2.