book Maths Puzzle Numerical Ability

Can you help me factor this polynomial?
18c^4 - 9c^2 + 7c

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Hi
I'm really stuck on two problems I have to do and have no idea how to solve them.The first one is a quadratic equation (i think). it says find all solutions to the equati Find two consecutive whole numbers such that the sum of their squares is 130

n(n+2)=130?