exam Maths Puzzle Numerical Ability

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Greatest common factor
4x^4-24x^3+8x^2

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exam Other Question

y^2-12y+36=49

c^2+16c+64=15 in a class of 68 students, there are 8 fewer democrats than republicans, and there are only half as many independents as democrats if every student is registered as a democrat, republican, or independent, how many students are in each group?