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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: 642 Thanks: 99 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 $\ln(x^{1/2})=\frac{1}{2}\ln(x)$. 
November 23rd, 2014, 04:50 PM  #3 
Newbie Joined: Nov 2014 From: Canada Posts: 2 Thanks: 0 
Thank you so much! 