# SOLUTION: Can you please give me an explanation on how to work these square root problems step by step as much as possible please? Thank you for your help. (5-4 sqrt5)(-2+ sqrt5) I'm s

Algebra ->  Algebra  -> Square-cubic-other-roots -> SOLUTION: Can you please give me an explanation on how to work these square root problems step by step as much as possible please? Thank you for your help. (5-4 sqrt5)(-2+ sqrt5) I'm s      Log On

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 Click here to see ALL problems on Square-cubic-other-roots Question 333895: Can you please give me an explanation on how to work these square root problems step by step as much as possible please? Thank you for your help. (5-4 sqrt5)(-2+ sqrt5) I'm sorry I couldn't type the square root sign. I am not sure what to do/where to begin with the number before the square root sign. Do I just add and subtract them out and them continue with simplifying my problem from there, or is there something special I need to do first. Thank you for your help again.Answer by tinbar(128)   (Show Source): You can put this solution on YOUR website!it's regular expansion (5-4root5)(-2+root5) = (5*-2)+(5root5)+(-4root5*-2)+(-4root5*root5) =(-10)+(5root5)+(8root5)+(-4*5) =(-10)+(13root5)+(-20) =13root5-30