exam Maths Puzzle Numerical Ability

Hi, I need to insert parentheses to make the following equation true.
-12a^3 + 2b^2 + 1728a^3 - 2b^2 - 2b^2 =0

Thank you.

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exam Other Question

8.) a^2 - b^2-c^2-2bc / a^2 + b^2-c^2-2ab

please explain this to me...
i tried factoring by grouping and ended up with a completely wrong answer on my worksheet ):
y=3/4*-3