book Maths Puzzle Numerical Ability

How do I use synthetic substitution to find f(3) for f(x) = 2x^4 - 3x^2 - x + 2

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book Other Question

start with 19, take away 1, leave 20. how do you do that? Lane invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1,430, how much did she invest at 15%?