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Shorten the following expressions:

a) $2 \sqrt{a^{2}} - 5 a$ with a < 0. b) $\sqrt{25 a^{2}}$ + 3a with a ≥ 0.

c) $\sqrt{9 a^{4}} + 3 a^{2}$ d) $5 \sqrt{4 a^{6}}$ - $3 a^{3}$ with a < 0