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= -2 + x - (x² - 4) + 1/3x + 2x² =
= -2 + x - x² + 4 + 1/3x + 2x² =
= 3x² + 1 1/3x + 2
dla
x= -1/23 * (-1/2)² + 1 1/3(-1/2) + 2 =
= 3 * 1/4 + 4/3(-1/2) + 2 =
= 3/4 - 2/3 + 2 = 9/12 - 8/12 + 2 = 1/12 + 2 = 2 1/12
dla x=-1/2
1/4-2/3+2=1+7/12