I saw this inequality problem at a web site
2x2<32
x2<16
but answer shows x<4
but why not x<-4
here's the link check it out
http://math.tutorvista.com/algebra/solving-inequalities.html
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.
Other people asked questions on similar topics, check out the answers they received:
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