(2x+4)(x-4)

Factoring!

(2x+4)(x-4)

First

Inner

Outer

Last

2x*x

2x*-4

4*x

4*-4

2x^2

-8x

4x

-16

Combine like terms

4x - 8x = -4x

And line them all up.

2x^2 - 4x - 16 is your final answer.

Another good one GL......(we're really expanding here, rather than factoring).....(if I keep eating, I may expand forever !!! )

Wow, I must have been really sleepy... expanding, not factoring. It was already factored >.<

No biggie...I knew what you meant....!!!