Answer:
Volume of a cuboid = Length \[\times \] Breadth \[\times \] Height \[=\left( {{x}^{2}}-2 \right)\left[ \left( 2x+2 \right)\left( x-1 \right) \right]\] \[=\left( {{x}^{2}}-2 \right)[2{{x}^{2}}-2x+2x-2]~~\] \[=({{x}^{2}}-2)[2{{x}^{2}}-2]\] \[=2\left( {{x}^{2}}-2 \right)\left( {{x}^{2}}-1 \right)\] \[=2\left[ {{x}^{4}}-{{x}^{2}}-2{{x}^{2}}+2 \right]\] \[=2\left[ {{x}^{4}}-3{{x}^{2}}+2 \right]~~\] \[=2{{x}^{4}}-6{{x}^{2}}+4\]
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