Math Software Math Software - Mathematica, Matlab, Calculators, Graphing Software

 November 23rd, 2014, 01:26 PM #1 Newbie   Joined: Nov 2014 From: Canada Posts: 2 Thanks: 0 Help please! Can anyone solve this? I asked my peers for help, and none of us were able to solve this. -Suppose you have a scientific calculator where some of the buttons are broken. In fact, the only working keys are the digits [0] to [9], [+],[-],[x],[*division sign*/], [ln], and [e^x]. Explain how you can use this calculator to calculate the square root of any whole number?
 November 23rd, 2014, 03:13 PM #2 Senior Member     Joined: Jul 2012 From: DFW Area Posts: 625 Thanks: 88 Math Focus: Electrical Engineering Applications Hi Tejasvg, and welcome to the forums. Punch in the number, take the ln, divide by 2 and then take e^x. For example, to take the square root of 56, type: [5],[6],[ln],[divide sign],[2],[=],[e^x] This works because $\ln(x^{1/2})=\frac{1}{2}\ln(x)$. Thanks from Tejasvg
 November 23rd, 2014, 04:50 PM #3 Newbie   Joined: Nov 2014 From: Canada Posts: 2 Thanks: 0 Thank you so much!

 Tags calculus, challenge, college, confusing, tough