sqrt(63) - 2sqrt(28) + 5sqrt(7) I got 3sqrt(7) - 2sqrt(7) + 1 (5)sqrt(7) 3-2+5 = 6sqrt7
D dkarolasz Junior Member Joined Jun 6, 2007 Messages 53 Jun 14, 2007 #1 sqrt(63) - 2sqrt(28) + 5sqrt(7) I got 3sqrt(7) - 2sqrt(7) + 1 (5)sqrt(7) 3-2+5 = 6sqrt7
J jwpaine Full Member Joined Mar 10, 2007 Messages 723 Jun 14, 2007 #2 sqrt(63) - 2sqrt(28) + 5sqrt(7) =[ 3sqrt(7) - 4sqrt(7) ] + 5sqrt(7) =-1sqrt(7) + 5sqrt(7) =4sqrt(7) 2sqrt(28) = 4sqrt(7) this is where you made a fatal mistake.
sqrt(63) - 2sqrt(28) + 5sqrt(7) =[ 3sqrt(7) - 4sqrt(7) ] + 5sqrt(7) =-1sqrt(7) + 5sqrt(7) =4sqrt(7) 2sqrt(28) = 4sqrt(7) this is where you made a fatal mistake.
D Denis Senior Member Joined Feb 17, 2004 Messages 1,707 Jun 14, 2007 #3 dkarolasz said: sqrt(63) - 2sqrt(28) + 5sqrt(7) I got 3sqrt(7) - 2sqrt(7) + 1 (5)sqrt(7) Click to expand... 2nd term should be 4sqrt(7)
dkarolasz said: sqrt(63) - 2sqrt(28) + 5sqrt(7) I got 3sqrt(7) - 2sqrt(7) + 1 (5)sqrt(7) Click to expand... 2nd term should be 4sqrt(7)