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(x + 2)(x -2) - x² = 3x - 4
x² - 4 - x² = 3x - 4
- 4 = 3x - 4
3x =- 4 + 4 = 0
x = 0
zad 2
(x + 3y)³ - (2x + y)³ = x³ + 9x²y + 27xy² + 27y³ - 8x³ - 12x²y - 6xy² - y³ =
= - 7x³ - 3x²y + 21xy² + 26y³