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 Calculus Calculus Math Forum

 August 25th, 2019, 04:06 AM #1 Newbie   Joined: Sep 2018 From: Spain Posts: 17 Thanks: 0 operations with functions Hi, it's a math problem. I can't remember the rules for adding, subtracting, multiplying and dividing fractions with roots. For example, f(x) the square root of x+1 added to f (g) 2/the square root of x+1. The answer was x+3 over the square root of x+1, but I don't know how they obtained this, the rules etc. Thank you. P.S. I would like to know what topic to study concerning the rules of adding, multiplying, dividing root fractions. Thank you. Last edited by skipjack; August 25th, 2019 at 04:39 AM. August 25th, 2019, 04:27 AM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 3,016 Thanks: 1600 $\sqrt{x+1} + \dfrac{2}{\sqrt{x+1}}$ common denominator is $\sqrt{x+1}$ ... $\dfrac{\sqrt{x+1} \cdot \sqrt{x+1}}{\sqrt{x+1}} + \dfrac{2}{\sqrt{x+1}}$ note $\sqrt{x+1} \cdot \sqrt{x+1} = x+1$ ... $\dfrac{x+1}{\sqrt{x+1}} + \dfrac{2}{\sqrt{x+1}} = \dfrac{x+1+2}{\sqrt{x+1}} = \dfrac{x+3}{\sqrt{x+1}}$ Recommend you search adding rational expressions August 25th, 2019, 05:42 AM #3 Newbie   Joined: Sep 2018 From: Spain Posts: 17 Thanks: 0 thank you skeeter! this was very helpful  Tags functions, operations Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post d9esco Algebra 2 September 19th, 2015 06:31 AM DanRayson Number Theory 5 September 18th, 2014 10:12 PM David Ellsworth Number Theory 4 April 25th, 2014 01:00 PM Lucida Algebra 2 June 29th, 2012 07:45 AM Lucida Algebra 4 June 26th, 2012 07:31 PM

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