Solve the inequality : `1/x + 8 <= 8 - (5x)/43`
You should reduce like terms both sides, hence the positive constant term 8 is found both sides and it needs to be reduced such that:
`1/x =lt -5x/43`
You need to move all terms containing x to the left side, such that:
`1/x + 5x/43 =lt ` 0
You need to bring the fractions to a common denominator, such that:
`(43 + 5x^2)/(43x) =lt` 0
You need to remember that the fraction is negative if the numerator and denominator possess different signs, hence you should discuss two situations:`(43 + 5x^2) =lt 0` and `43x gt 0` or `(43 + 5x^2)gt= 0` and `43xlt 0` .
Considering the first situation yields:
`43x gt 0 =gt xgt0 =gt x in (0,oo)`
`(43 + 5x^2) =lt 0 =gt (43 + 5x^2) = 0 =gt 5x^2 = -43 ` contradiction
Since the equation `43 + 5x^2 = 0` is never negative or zero, hence this situation needs to be disregarded.
Considering the situation `(43 + 5x^2)gt= 0 ` and `43xlt 0` yields:
`43x lt 0 =gt x lt 0 =gt x in (-oo,0)`
The expression (`43 + 5x^2` ) is always positive and never zero, hence the values of x are in `(-oo,0)U(0,oo).`
Notice that the values of x in `(0,oo)` fail to verify the equation 43x<0, hence the only values of x that check both numerator and denominator are in `(-oo,0)` .
Hence, evaluating the values of x that check the inequality yields x in `(-oo,0)` .