(a - b)² = a² - 2ab + b²
9x² - 6xy + 4y² ≥ 0
(3x)² - 2*3x*y + y² + 3y² ≥ 0
(3x - y)² + 3y² ≥ 0
x, y ∈ R
= 0 при x = y = 0
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(a - b)² = a² - 2ab + b²
9x² - 6xy + 4y² ≥ 0
(3x)² - 2*3x*y + y² + 3y² ≥ 0
(3x - y)² + 3y² ≥ 0
x, y ∈ R
= 0 при x = y = 0