book Maths Puzzle Numerical Ability

start with 19, take away 1, leave 20. how do you do that?

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RAtional Expression

3x^2-18x
________
-9x^2
-x^2/3x^2-18x/0+0
-0x^2
3x^2-18x
-0x^2
3x^2-18x How do I use synthetic substitution to find f(3) for f(x) = 2x^4 - 3x^2 - x + 2