a² - b² = (a - b)(a + b)
(a - b)² = a² - 2ab + b²
f(x) = x² - 4x - 5
a) x² - 4x + 4 - 9 = (x - 2)² - 9
b) x² - 4x - 5 = (x - 2)² - 9 = (x - 2 - 3)(x - 2 + 3) = (x - 5)(x + 1)
c) одз x ∈ (-∞, +∞)
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a² - b² = (a - b)(a + b)
(a - b)² = a² - 2ab + b²
f(x) = x² - 4x - 5
a) x² - 4x + 4 - 9 = (x - 2)² - 9
b) x² - 4x - 5 = (x - 2)² - 9 = (x - 2 - 3)(x - 2 + 3) = (x - 5)(x + 1)
c) одз x ∈ (-∞, +∞)