My Math Forum Not sure how to write the formula.

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 March 16th, 2016, 02:38 PM #1 Senior Member   Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10 Not sure how to write the formula. Twice the difference of a number and four is four. Find the number. I was thinking 2(-x+4)=4 but of course it's wrong.
 March 16th, 2016, 03:04 PM #2 Global Moderator   Joined: Dec 2006 Posts: 18,954 Thanks: 1601 The difference between the number and four is two, so the number is either two or six.
March 16th, 2016, 03:57 PM   #3
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Quote:
 Originally Posted by skipjack The difference between the number and four is two, so the number is either two or six.
Thanks it says it is 6 I believe, just not sure how I would write the formula to be able to find that it is 6. thanks for your reply.

March 16th, 2016, 06:01 PM   #4
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 Originally Posted by GIjoefan1976 Thanks it says it is 6 I believe, just not sure how I would write the formula to be able to find that it is 6. thanks for your reply.
2 (x – 4) = 4
x = 6
I agree with skipjack that number is either 2 or 6, but subtraction is always order–sensitive, and the question says that difference of a number and four is four, so the number has to be 6.

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