(x+2)(x²-2x+4)-x(x-3)(x+3)-42=(x³-2x²+4x+2x²-4x+8)-x(x²-9)-42=x³+8-x³+9x-42=9x+8-42=9x-34
(x-3)(x²+3x+9)-x(x²-16)+21=(x³+3x²+9x-3x²-9x-27)-x³+16x+21=x³-27-x³+16x+21=16x-27+21=16x-6
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(x+2)(x²-2x+4)-x(x-3)(x+3)-42=(x³-2x²+4x+2x²-4x+8)-x(x²-9)-42=x³+8-x³+9x-42=9x+8-42=9x-34
(x-3)(x²+3x+9)-x(x²-16)+21=(x³+3x²+9x-3x²-9x-27)-x³+16x+21=x³-27-x³+16x+21=16x-27+21=16x-6