Originally Posted by

**Nightasylum** .wysiwyg { BACKGROUND: #ffffff; FONT: 10pt verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; COLOR: #000000 } P { MARGIN: 0px } .inlineimg { VERTICAL-ALIGN: middle } find the X value if any at which f is not continuous.

Which of the discontinuities are removable?

f(x)= X^2-9

Ok im not sure what im sopes to be doing here.

I know X = 3 the back of the book says the answer is "Continuous for all real x". Can any one help explain why the answer, and help me with a few more.