How di I turn a decimal like -4.646 into a number like -2 - sqrt(7)

OfficialBubbleTanks
Nov 2, 2017

#1**+3 **

Notice that

-2 - √ 7 is an irrational number [ can't be expressed as a fraction]

But -4.646 * is* rational [

So......it's impossible to turn a rational into an irrational - and vice-versa......

CPhill
Nov 2, 2017

#2**+2 **

well i had 4.646 rounded...desmos doesn't go very deep into decimals for me XD

OfficialBubbleTanks
Nov 2, 2017

#3**+1 **

Were you trying to solve an equation,OBT????

If so...post the problem and we'll see if we can solve it

CPhill
Nov 2, 2017

#4**+1 **

i figured it out, don't trust desmos XD

thanks anyway! i have no idea how many of my questions you have answered, but it is definitely a lot!

OfficialBubbleTanks
Nov 2, 2017