Add/Subtract Polynomials

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Simplify $8\left(8a^{2}-3a+2\right)-4\left(2a^{2}-3\right)$

**Answer**

$\;\;\;8\left(8a^{2}-3a+2\right)-4\left(2a^{2}-3\right)$

$=64a^{2}-24a+16-8a^{2}+12$

$=(64a^{2}-8a^{2})+(-24a)+(16+12)$

$=56a^{2}-24a+28$