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-3x² - 6x + 1 + 4x² - 12x - 4 =
x² - 18x - 3
dla x = -2
x² - 18x - 3 = (-2)² - 18 *(-2) - 3 = 4 + 36 - 3 = 37
b) -xy(x - 3y) -x(xy + 4y²) =
-x²y + 3xy² - x²y - 4xy² =
-2x²y - xy²
dla x = 0,1 i y = 10
-2x²y - xy² = -2 *(0,1)² * 10 - 0,1 * 10² =
-2 * 0,01 * 10 - 0,1 * 100 =
-0,02 * 10 - 10 =
-0,2 - 10 = - 10,2