exam Maths Puzzle Numerical Ability

Factor completly
5x^2-5xy-10x+10y

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exam Other Question

Can you tell me tell me what properties these problems are?

6*(8+c)= (8+c)*6
(a+b)*1= a+b
14xy = 14yx Simplify and reduce to lowest terms

(sqrt)16/(sqrt)32

and

(sqrt)8+(sqrt)32