Question 1204654
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What's this?! A reader who actually showed in his post the work he has done on the problem??!!  Amazing....<br>
Thank you!<br>
I see you know what you are doing, so I will just point out your error and let you continue working on the problem.<br>
When you complete the square, you show, on the right side, adding (1/4) + 1.<br>
What you should be adding is 9(1/4) + 25(1).  That's a very common error, even with people experienced with the process of completing the square, if they aren't paying attention....<br>
That will make the number on the right 225, which is 15^2, making it easy to finish the problem with "nice" numbers.<br>