exam Maths Puzzle Numerical Ability

need some help factoring

8x8 - 20x6 - 12x4 - 20x3

not sure how low to break it down. thank you for your time David.

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exam Other Question

given: f(x)=x-3 and g(x)=x-2 find f*g(x)

Thanks This year, 75% of the graduating class of Harriet Tubman HS had taken at least 8 math courses. Of the remaining class members, 60% had taken 6 or 7 math courses. What percent of the graduating class had taken fewer than 6 math courses?