book Maths Puzzle Numerical Ability

i need help factoring trinomials with a coefficient of x2 greater than 1 for example 3x2(square)+10x+8

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Solve for x y=1/3x=-2 could you plese help me someone How should $9000 be divided into two accounts, paying 5.5% and 8% interest, so that the total interest after one year equals $630?