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a)2x(x-5) - 3(x² - 2x) + (x-2)x = 2x²-10x-3x²+6x+x-2 = -x²-3x-2
b)a(a + b + c) -b(a-b+c) - c(a-b-c) = a²+ab+ac-ab-b²-bc-ac+bc+c²
Oblicz wartości liczbowe wyrażeń:
3(x²-2x+3) - 2(x² - 5x - 1) = 3x²-6x+9-2x²+10x-1 = 3(2)²-6*2+9-2(2)²+10*2-1=12-12+9-8+20-1=20
proszę naj