exam Maths Puzzle Numerical Ability

I can not figure out how to solve. I am confused, please help

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exam Other Question

Can someone please help me factor this equation?
2x^3-3x^2+2
Thank you An arch is semi-elliptical with a base that is 20 feet wide and a height at the center of 8 deet. How high is the arch 6 feet from the center of the base.