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2x[x-5]- 3 [x² -2x ]+ [x-2]x =
2x²-10x-3x²+6x+x²-2x =
3x²-6x
b)
a[a+b+c]-a[-b+c]-c[a-b-c] =
a²+ab+ac+ab-ac-ac+bc+c² =
a²+2ab-ac+bc+c²
c)
x[x² + 2x+1]-[-4x³+8x² - 6]:2 =
x³+2x²+x+2x³-4x²+3 =
3x³-2x²+x+3