exam Maths Puzzle Numerical Ability

Hello,
can anyone help me factor these polynomals completely.
Much appreciated.

Todd

125 - 8x cubed ?

54t cubed + 16v cubed. I believe this one must ne prime

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exam Other Question

can you help me simplify?

10sqrt7-sqrt28
6x^2 + x - 2 = 0

I am just learning this...Help!