# SOLUTION: Help! I'm having difficulties figuring this one out... (sq.root of 3 + sq.root of 5)(sq.root of 3 + sq.root of 5) = ???

Algebra ->  Radicals -> SOLUTION: Help! I'm having difficulties figuring this one out... (sq.root of 3 + sq.root of 5)(sq.root of 3 + sq.root of 5) = ???       Log On

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 Algebra: Radicals -- complicated equations involving roots Solvers Lessons Answers archive Quiz In Depth

 Question 85292: Help! I'm having difficulties figuring this one out... (sq.root of 3 + sq.root of 5)(sq.root of 3 + sq.root of 5) = ??? Answer by stanbon(60771)   (Show Source): You can put this solution on YOUR website!(sq.root of 3 + sq.root of 5)(sq.root of 3 + sq.root of 5) --------- (sqrt3 + sqrt5)(sqrt3 + sqrt5) Use FOIL: F: sqrt3*sqrt3 = 3 O: sqrt3*sqrt5 = sqrt15 I: sqrt5*sqrt3 = sqrt15 L; sqrt5*sqrt5 = 5 ---------- Combine like terms to get: 8 + 2sqrt15 =================== Cheers, Stan H.