exam Maths Puzzle Numerical Ability

I dont understand how to start the problem or finish it either.

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I am having trouble factoring 6x^6-24x^4+18x^2---I cant figure out what to begin with when I start to factor. Should I take out a 3x^2? If a bridge that is one mile long is attached to the ground on either side, and you cut it in the middle and add one foot, what is the height of how far the bridge bows up in the middle?