I'm stuck - XP Math - Forums

 XP Math - Forums I'm stuck

 10-22-2006 #1 Sillysidley Last Achievements   Join Date: Oct 2006 Posts: 822 I'm stuck Find 2x+5 if x satisfies sqrt(40-9x)-2sqrt(7-x)=sqrt(-x) I'm stuck HElP!!!
 10-22-2006 #2 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 First, square both sides to remove complex (imaginary) numbers. Then, solve equation for x. It involves manipulating radicals. __________________ Do Math and you can do Anything! Last edited by Mr. Hui; 10-22-2006 at 01:48 PM..
 10-22-2006 #3 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 Radicals are expression involving the square root symbol. __________________ Do Math and you can do Anything!
 10-25-2006 #4 Sillysidley Last Achievements   Join Date: Oct 2006 Posts: 822 I don't know about this... Is x=1?????? Thanks for the help
 10-25-2006 #5 Sillysidley Last Achievements   Join Date: Oct 2006 Posts: 822 sorry/is the answer to the problem 7 Whoops, didn't read the question. Is the answer to the problem 7?
 10-25-2006 #6 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 No, if you plug in x = 7, you won't get the two sides equal. I will provide you with a complete solution. __________________ Do Math and you can do Anything!
 10-25-2006 #7 Sillysidley Last Achievements   Join Date: Oct 2006 Posts: 822 I made a mistake it should be something like 40-9x+7+x+2sqrt... __________________ .
 10-26-2006 #8 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 As promised, here is the completely worked out solution. Click to enlarge Attached Thumbnails   __________________ Do Math and you can do Anything!
 10-26-2006 #9 Alex a.k.a whiteboy Guest   Posts: n/a wtf wtf dont show that again
 10-30-2006 #10 puppydog Guest   Posts: n/a show what??

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