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-4x(x+2)-(3x+1)(-4x+6)-4(x+1)=
= -4x² - 8x + 12x² - 18x + 4x - 6 - 4x - 4 =
= 8x² - 26x - 10
b)
(x+2)(x-1)-(2x-1)(3x-5)+10=
= x² - x + 2x - 2 - 6x²+ 10x + 3x - 5 + 10 =
= -5x² + x + 13x + 3 = -5x² + 14x + 3