Questions on Algebra: Proportions answered by real tutors!

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Question 148968: solve the proportion 3x 4
-- = --
x + 1 x: solve the proportion 3x 4
-- = --
x + 1 x
Answer by mangopeeler07(445) About Me  (Show Source):
You can put this solution on YOUR website!
3x/x+1=4/x

Cross multiply:
3x^2=4x+4

Set equal to zero
3x^2-4x-4=0

Factor
(3x+2)(x-2)=0

Solve for x
x=-2/3,2