Inequality to be solved:
(5/x-1) - (2x/(x+1) < 1
Multiply each term by common denominator (x-1)(x+1) to clear fractions:
5x - 5 - 2x
2 + 2 < x
2 - 1
Set right side to zero to set up quadratic inequality
-3x
2 +5x - 2 < 0
Multiply each term by negative 1 get rid of negative sign in front of coefficient of x square term:
3x
2 - 5x + 2 > 0
Rewrite coefficient of x term as sum two factors of product of coefficient of x square term and constant term(factors of 6 (3 x 2) which add up to -5 are -6 and +1):
3x
2 + (-6 + 1)x - 2 > 0
Distribute x over terms in parens:
3x
2 - 6x + x - 2 > 0
Factor 1st terms and last 2 terms:
3x(x-2) + 1(x-2) > 0
Pull out common factor (x-2) from both terms to complete factoring:
(3x-1)(x-2) > 0
Set each factor to zero to get critical points of x to set up number line regions:
3x - 1 = 0; x = 1/3x - 2= 0; x = +2
Use test points for (3x-1)(x-2) > 0 for testing a positive outcome for region of number line based upon critical points of x:
x < 1/3 1/3 < x < 2 x > 2 use x = 0 use x = 1 use x = 3
3x-1 -1 (-) 2 (+) 8 (+) x-2 -2 (-) -1 (-) 1 (+)------------------------------------------------------------------------------(3x-1)(x-2) 2 (+) -2 (-) 8 (+)
Solution: x < 1/3 or x > 2
Number Line:
1. Shade region x < 1/3 with open circle at 1/3 2. Shade region x > 2 with open circle at 2