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9x²+16y²+12x-16y-24xy+4
(2x-y-4)²=(2x-y)²-2*4(2x-y)+16=4x²-4xy+y²-16x+8y+16=
4x²+y²-16x+8y-4xy+16
(0,3)^{-3}=(10/3)³=1000/27
9x² + 6x - 12xy + 6x + 4 - 8y - 12xy - 8y + 16y² =
9x² + 16y² - 24xy + 12x - 16y + 4
(2x - y - 4)² = (2x - y - 4)(2x - y - 4) = 4x² - 2xy - 8x - 2xy + y² + 4y - 8x + 4y + 16 =
4x² + y² - 4xy - 16x + 8y + 16
(0,3)⁻³ = 1 / (0,3)³ = 1 / (3/10)³ = (10/3)³ = 1000 / 27 ≈ 37,04