book Maths Puzzle Numerical Ability

how do u do sythetic division (i know nothing about this topic whatsoever)Please explain for a beginner like me

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book Other Question

If x^4+(1/x^4)=731, find the value of x^2-(1/x^2).
thank you
Subtract.

2/5w + 10 minus 3/2w - 4

Thanks!