exam Maths Puzzle Numerical Ability

2radical3 * 5radical27

how do you do a radical sign?

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given f(x)=15x^3-4x^2+3x-8, find all possible rational zeros

thanks for your help
How do you factor the following problems step by step?

1. 9-x^2
2. 4x^2+81-36x
3. 4y^2+16y+16
4. x^-25/x+5