# Simple algebra question on gre

$21+x^2 +(x+1)+16+22+17+x = 100$%

The solution guide gives me $x^2 + 2x + 76 = 100$

Then $x^2+2x-24=0$

I just don't get where $x+1$ went..

I keep getting $x^2+2x+77=100$ what am I doing wrong somebody help me]1

• This is on the GRE general test? I'm impressed. I don't recall there being quadratic equations when I took the test in $2008$. They're raising the bar! – Matt Samuel Mar 2 '17 at 3:30
• $21 + 16+ 22 + 17 = 76$ and the $1$ from $(x+1)$ gives $77$. I'm with you. Either the solution's wrong or there's something you aren't telling us that changes things – spaceisdarkgreen Mar 2 '17 at 3:30
• Something is not right in the exercise. We are combining three odd numbers and the solution manual has a constant of 24. Double check or provide us with a picture of the page. Normally inserting page pictures to solve a problem is not so well appreciated, but if a mistake in a textbook is perceived, we would like to take a look at it... – imranfat Mar 2 '17 at 3:31
• I've added the image of problem pls help me asap – Sooo Mar 2 '17 at 3:39
• this is a practice problem for gre – Sooo Mar 2 '17 at 3:46