Please help me solve this inequality

I saw this inequality problem at a web site



but answer shows x<4

but why not x<-4

here's the link check it out

Liked this question? Tell your friends about it


The answer to x^2 < 16 cannot be x < -4 because for example x = -5 gives x^2 = 25.  The solution x < 4 is OK for positive x, but x = -5 would still be a problem.  The correct answer is |x| < 4, or -4 < x < 4.

Related Questions

Other people asked questions on similar topics, check out the answers they received:

Asked: Which category can you NOT win a Nobel Prize in ...

Which category can you NOT win a Nobel Prize in Mathematics or Economics?

Asked: Science Breakthroughs The Koyal Group InfoMag News ...

Our image shows an artist's impression of the European Extremely Large Telescope , or E-ELT, whose 39-metre aperture puts it in line to be the world's largest optical-infrared telescope. Being built ...

Asked: Oxidizable carbon ratio dating--is this secular ...

From: See the link if images/formatting don't show. Oxidizable carbon ratio dating, Mario Modesto Mata by Tas Walker MM from ...

Be The First To Answer

Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them

More Questions

Plz help

Hi there: Please try calling the following number for assistance: 1-855-622-4946.

My aol mail account is down ... Help please!

Hi Gary: So I can better assist you, could you please provide me with additional information? Do you get an error message? If you get an error message, could you tell me what it says? Thank you.

Please help with downloading aol

Hi Jerry: For assistance, please refer to the help article below. Message: Your computer is currently running communication software that needs to be shut down before installing AOL

Security Question Help

Hi Doug: For assistance, please refer to the help article below. I forgot the answer to my AOL Account Security Question