Talk:A-level Mathematics/OCR/C1/Error bounds and Inequalities

Solving Inequalities involving Fractions
I think there is error in this section (i.e. "Solving Inequalities involving Fractions"). It says:

"Step 1:$$\frac{1}{x+1}-\frac{5-x}{x+1}\le 0$$ then simplified it becomes $$\frac{x-5}{x+1}\le0$$"

but shouldn't this be:

"Step 1:$$\frac{1}{x+1}-\frac{5-x}{x+1}\le 0$$ then simplified it becomes $$\frac{x-4}{x+1}\le0$$"

? The rest of the example has to be corrected, too, of course...

83.238.180.4 14:38, 6 June 2007 (UTC)

I agree there is an error - which can be proved. Put in x= 5 (one of the solutions listed) and the inequality becomes 1/6 <= 0/6 which is false !

However - why didn't you fix it when you found it? --Benny 18:11, 11 September 2007 (UTC)

In the end I changed the example so that the images were correct Benny 18:40, 11 September 2007 (UTC)

Actually there is an error in the interval notation also Benny 18:43, 11 September 2007 (UTC)