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2. 2x^2 - 3x + 5 - 3x^2 + x - 9
= -x^2 - 2x - 4
3. K = 2(p + l)
= 2(2x + 3 + x - 1)
= 2(3x + 2)
= 6x + 4
4. 27 - 4y = 3(4 - 3y)
27 - 4y = 12 - 9y
-4y + 9y = 12 - 27
5y = -15
y = -3
5. 0,69 > 0,089