Step-by-step explanation:

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Answer:

=(2)^5.7(a)^2-(2)^4(a)^3

Step-by-step explanation:

Given=-2{3a-4[a-(2+a)]}

=-2{3a-4[-2a-a^2]}

=-2{3a[8a-8a^2]}

=-2{24a^2-8a^3}

=-1{48a^2-16a^3}

then it can be written as

=(2)^5.7(a)^2-(2)^4(a)^3