My Math Forum Change Subject of Formula

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 May 31st, 2015, 10:25 AM #1 Newbie   Joined: Feb 2015 From: United Kingdom Posts: 8 Thanks: 1 Change Subject of Formula Hey guys. The exercise requires me to change the subject of the formula to X. Here is my solving: Problem is my book says the awnser should be : x= d/mn-b Thanks
 May 31st, 2015, 10:30 AM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 At the point where you multiply both sides of the equation by x, you multiply wrong. You have $\displaystyle \frac{d}{x}= mn- b$. Multiplying both sides by x gives $\displaystyle d= (mn- b)x$, NOT what you have. Thanks from marcus2015

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