exam Maths Puzzle Numerical Ability

How would you multiply this binomial?

(4c-1)^2

I came up with 16c^2-8c+1... is that correct... or is it 16c^2+8c+1?

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exam Other Question

please help me solve this question (-67=6x-1) (3x+5)*2x-2/3x^2+2x-5

I see that I would cancel out the 2x can I cancel out the 3x?

(3x+5)*-2/3x^2-5

I am confused can you help?