1.

Simplify: \[({{a}^{3}}-2{{a}^{2}}+4a-5)-(-{{a}^{3}}-8a+2{{a}^{2}}+5)\]

A.  \[2{{a}^{3}}+7{{a}^{2}}+6a-10\]
B.  \[2{{a}^{3}}+7{{a}^{2}}+12a-10\]
C.  \[2{{a}^{3}}-4{{a}^{2}}+12a-10\]
D.  \[2{{a}^{3}}-4{{a}^{2}}+6a-10\]
Answer» D.  \[2{{a}^{3}}-4{{a}^{2}}+6a-10\]


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