My Math Forum Align equals signs

 LaTex Help Help with LaTex and writing math equations

 February 21st, 2015, 01:07 AM #1 Newbie   Joined: Dec 2014 From: Singapore Posts: 23 Thanks: 0 Align equals signs Hi I know this has been mentioned many times but I'm still not clear: What is the exact code for: If $f(x)=x^{3}$, then $f'(x)=3x^{2}$ $=600$ but with all 3 equals signs aligned?
 February 21st, 2015, 01:55 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,059 Thanks: 1618 If $f(x)=x^{3}$, then $\,\,\ f'(x)=3x^{2}$ $\,\,\,\ \ \ \ \ \ \ \ \ =600$
 February 21st, 2015, 10:20 AM #3 Math Team     Joined: May 2013 From: The Astral plane Posts: 1,797 Thanks: 715 Math Focus: Wibbly wobbly timey-wimey stuff. It spreads out a bit, but you could also try this: $\displaystyle \begin{matrix} f(x) & = & x^3 \\ f'(x) & = & 3x^2 \\ ~ & = & 600 \end{matrix}$ -Dan
 February 21st, 2015, 09:21 PM #4 Newbie   Joined: Dec 2014 From: Singapore Posts: 23 Thanks: 0 What's the code? As in what you typed to get the aligned equals signs?
 February 22nd, 2015, 01:10 AM #5 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 1,961 Thanks: 132 Math Focus: Trigonometry Looks like he means the Latex code, guys. To be honest, I also don't know. But Chris A, you can quote topsquark's post to see what codes he used. Thanks from topsquark
 February 22nd, 2015, 01:13 AM #6 Senior Member     Joined: Apr 2014 From: Greater London, England, UK Posts: 320 Thanks: 155 Math Focus: Abstract algebra Code: \begin{array}{rcl} \text{If}\ f(x) & = & x^3,\ \text{then} \\ f'(x) & = & 3x^2 \\ & = & 600 \end{array} gives $\displaystyle \begin{array}{rcl} \text{If}\ f(x) & = & x^3,\ \text{then} \\ f'(x) & = & 3x^2 \\ & = & 600 \end{array}$
 February 22nd, 2015, 02:35 AM #7 Global Moderator   Joined: Dec 2006 Posts: 19,059 Thanks: 1618 You can click on the Quote button of an earlier post to find out what code was used. Below is another method that works (and I recommend) if you don't want to mix normal text and latex code. Click on the Quote button for this post to see the code I've used. \displaystyle \begin{align*}\text{If }f(x) &= x^3,\text{ then} \\ f\,'(x) &= 3x^2 \\ &= 600 \end{align*} Thanks from topsquark
 February 22nd, 2015, 10:13 AM #8 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,167 Thanks: 472 Math Focus: Calculus/ODEs Another alternative is to use: $\displaystyle \begin{array}{rl}f(x)\hspace{-12px}&=x^3\\f'(x)\hspace{-12px}&=3x^2\\&=600\end{array}$ And another way to view the code people are using is to right-click any expression and follow: Show Math As ► TeX Commands And a popup will display the code used. Note: This only works with MathJax rendered $\LaTeX$, but the vast majority here are using it rather than mimetex. Thanks from topsquark Last edited by MarkFL; February 22nd, 2015 at 10:16 AM.

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