Упростите выражения:
1) (x + 2)(x² - 2x + 4) - x(x - 3)(x + 3) - 42
2) (x - 3)(x² + 3x + 9) - x(x² - 16) + 21;
3) (2x - 1)(4x² + 2x + 1) - 23 - 4x(2x² + 3)
4) 16x(4x² - 5) + 17 - (4x + 1)(16x² - 4x + 1)

1)

\[\begin{aligned}(x+2)(x^2-2x+4)-x(x-3)(x+3)-42&=x^3+8-(x^3-9x)-42\\&=9x-34.\end{aligned}\]

2)

\[\begin{aligned}(x-3)(x^2+3x+9)-x(x^2-16)+21&=x^3-27-(x^3-16x)+21\\&=16x-6.\end{aligned}\]

3)

\[\begin{aligned}(2x-1)(4x^2+2x+1)-23-4x(2x^2+3)&=8x^3-1-23-8x^3-12x\\&=-12x-24.\end{aligned}\]

4)

\[\begin{aligned}16x(4x^2-5)+17-(4x+1)(16x^2-4x+1)&=64x^3-80x+17-(64x^3+1)\\&=-80x+16.\end{aligned}\]

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